docs: improve formatting and document structure

Change-Id: I530d58f2700eb264855843021db32f568d373a1d
diff --git a/docs/RELEASE-NOTES.rst b/docs/RELEASE-NOTES.rst
deleted file mode 100644
index 04e2f84..0000000
--- a/docs/RELEASE-NOTES.rst
+++ /dev/null
@@ -1,4 +0,0 @@
-Release Notes
-=============
-
-.. include:: release-notes-latest.rst
diff --git a/docs/conf.py b/docs/conf.py
index a7b4832..1e61a46 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -10,7 +10,7 @@
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information
 
 project = 'Named Data Link State Routing Protocol (NLSR)'
-copyright = 'Copyright © 2014-2022 Named Data Networking Project.'
+copyright = 'Copyright © 2014-2023 Named Data Networking Project.'
 author = 'Named Data Networking Project'
 
 # The short X.Y version.
diff --git a/docs/index.rst b/docs/index.rst
index 27a28ba..fa1ee00 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -1,29 +1,5 @@
-NLSR - Named Data Link State Routing Protocol
-=============================================
-
-NLSR is a routing protocol in NDN that populates NDN's Routing Information Base. NLSR will
-continue to evolve alongside the Named Data Networking `protocol
-<https://named-data.net/doc/NDN-packet-spec/current/>`_.
-
-NLSR is an open and free software package licensed under the GPL 3.0 license and free to
-all Internet users and developers. For more information about the licensing details and
-limitations, refer to `COPYING.md
-<https://github.com/named-data/NLSR/blob/master/COPYING.md>`_.
-
-NLSR is developed by the members of the `NSF-sponsored NDN project team
-<https://named-data.net/project/participants/>`_. For more details, please refer to
-`AUTHORS.md <https://github.com/named-data/NLSR/blob/master/AUTHORS.md>`_. Bug reports and
-feedback are highly appreciated and can be made through the `NLSR Wiki`_.
-
-The main design goal of NLSR is to provide a routing protocol to populate NDN's FIB. NLSR
-calculates the routing table using link-state or hyperbolic routing and produces multiple
-faces for each reachable name prefix in a single authoritative domain. NLSR will continue
-to evolve over time to include neighbor discovery and to become a full fledged
-inter-domain routing protocol for NDN.  The protocol design is presented in full detail in
-the `NLSR Paper`_.
-
-NLSR Documentation
-------------------
+NLSR: Named Data Link State Routing Protocol
+============================================
 
 .. toctree::
    :hidden:
@@ -33,47 +9,74 @@
    INSTALL
    SECURITY-CONFIG
    ROUTER-CONFIG
-   RELEASE-NOTES
-   releases
-   manpages
    beginners-guide
+   manpages
+   release-notes
+   releases
 
--  :doc:`GETTING-STARTED`
--  :doc:`INSTALL`
--  :doc:`SECURITY-CONFIG`
--  :doc:`ROUTER-CONFIG`
--  :doc:`RELEASE-NOTES`
--  :doc:`releases`
--  :doc:`manpages`
--  :doc:`beginners-guide`
+**NLSR** is a routing protocol for NDN that populates NDN's Routing Information Base.
+NLSR will continue to evolve alongside the Named Data Networking `protocol
+<https://named-data.net/doc/NDN-packet-spec/current/>`__.
+
+The main design goal of NLSR is to provide a routing protocol to populate NDN's FIB. NLSR
+calculates the routing table using link-state or hyperbolic routing and produces multiple
+faces for each reachable name prefix in a single authoritative domain. NLSR will continue
+to evolve over time to include neighbor discovery and to become a full fledged
+inter-domain routing protocol for NDN.  The protocol design is presented in full detail in
+the `NLSR Paper`_.
+
+NLSR was mainly developed by members of the NSF-sponsored `NDN project team
+<https://named-data.net/project/participants/>`__.  See `AUTHORS.md
+<https://github.com/named-data/NLSR/blob/master/AUTHORS.md>`__ for details.
+
+Bug reports and feedback are highly appreciated and can be made through the `NLSR Redmine`_.
+
+Documentation
+-------------
+
+- :doc:`GETTING-STARTED`
+- :doc:`INSTALL`
+- :doc:`SECURITY-CONFIG`
+- :doc:`ROUTER-CONFIG`
+- :doc:`beginners-guide`
+- :doc:`manpages`
+- :doc:`release-notes`
+- :doc:`releases`
 
 Downloading
 -----------
 
--  `Source code git repository <https://github.com/named-data/NLSR>`_
+- `Source code git repository <https://github.com/named-data/NLSR>`__
 
 NLSR mailing list
 -----------------
 
--  `NLSR Mailing List`_
-
--  `NLSR Mailing List Archives`_
+- `NLSR Mailing List`_
+- `NLSR Mailing List Archives`_
 
 `Sign up`_ is needed to post to the list or access the archives.
 
-Additional information
-----------------------
+Additional resources
+--------------------
 
--  `NLSR Wiki`_
+- `NLSR Wiki`_
 
--  `NLSR Redmine`_
-   Feature requests and bug reports
+- `NLSR Redmine`_
+  Feature requests and bug reports
 
--  `NLSR Paper`_
-   Detailed explanation of the NLSR design
+- `NLSR Paper`_
+  Detailed explanation of NLSR's design
 
--  `NLSR Developer's Guide`_
-   For NLSR Development
+- `NLSR Developer's Guide`_
+  For NLSR development
+
+- `API documentation (doxygen) <doxygen/annotated.html>`__
+
+License
+-------
+
+NLSR is free software distributed under the GNU General Public License version 3.
+See `COPYING.md <https://github.com/named-data/NLSR/blob/master/COPYING.md>`__ for details.
 
 .. _NLSR Wiki: https://redmine.named-data.net/projects/nlsr/wiki
 .. _NLSR Paper: https://named-data.net/wp-content/uploads/2016/01/ndn-0037-1-nlsr.pdf
diff --git a/docs/manpages/nlsrc.rst b/docs/manpages/nlsrc.rst
index f91706b..81d92f2 100644
--- a/docs/manpages/nlsrc.rst
+++ b/docs/manpages/nlsrc.rst
@@ -79,18 +79,15 @@
 When security is enabled, NLSR will not be allowed to successfully
 advertise/withdraw names without first setting a default identity of operator.
 If default identity is not set as operator, the user will be presented with the
-error message: “Name prefix update error (code: 403)”. To remedy this
-issue, use command 'ndn-sec-default'.
+error message: "Name prefix update error (code: 403)". To remedy this
+issue, use the command ``ndnsec set-default``. Example::
 
-Example:
-
-  ndnsec-set-default /ndn/a-site/%C1.Operator/op
+  ndnsec set-default /ndn/a-site/%C1.Operator/op
 
 Exit Status
 -----------
 
-nlsrc exits with one of the following values:
-::
+nlsrc exits with one of the following values::
 
   0     nlsrc exited successfully
   >0    An error occurred
diff --git a/docs/release-notes-latest.rst b/docs/release-notes-latest.rst
deleted file mode 120000
index cbbc128..0000000
--- a/docs/release-notes-latest.rst
+++ /dev/null
@@ -1 +0,0 @@
-release-notes/release-notes-0.6.0.rst
\ No newline at end of file
diff --git a/docs/release-notes.rst b/docs/release-notes.rst
new file mode 100644
index 0000000..7a816ba
--- /dev/null
+++ b/docs/release-notes.rst
@@ -0,0 +1,4 @@
+Release Notes
+=============
+
+.. include:: release-notes/release-notes-0.6.0.rst
diff --git a/docs/release-notes/release-notes-0.5.2.rst b/docs/release-notes/release-notes-0.5.2.rst
index aa4c526..d65d507 100644
--- a/docs/release-notes/release-notes-0.5.2.rst
+++ b/docs/release-notes/release-notes-0.5.2.rst
@@ -3,15 +3,16 @@
 
 **Breaking Changes**
 
-The following breaking changes makes this release incompatible with the previous version.
-- Use latest PSync version 0.2.0, sync data compression enabled in full sync by default (:issue:`5061`, :issue:`4917`)
-- Use the double encoding/decoding functions for hyperbolic coordinates (:issue:`4615`)
+The following breaking changes make this release incompatible with the previous version.
+
+- Use PSync version 0.2.0, sync data compression in full sync is enabled by default (:issue:`5061`, :issue:`4917`)
+- Use the floating point encoding/decoding functions for hyperbolic coordinates (:issue:`4615`)
 
 **New Features**
 
 - Handle zero cost links in Link State Routing (:issue:`4978`)
 
-**Improvements and Bug Fixes**:
+**Improvements and Bug Fixes**
 
 - Remove support for old combined seq no file (:issue:`4143`)
 - Sync common test infrastructure with ndn-cxx
diff --git a/docs/release-notes/release-notes-0.6.0.rst b/docs/release-notes/release-notes-0.6.0.rst
index 1701c67..04c17c1 100644
--- a/docs/release-notes/release-notes-0.6.0.rst
+++ b/docs/release-notes/release-notes-0.6.0.rst
@@ -1,10 +1,12 @@
 NLSR version 0.6.0
-++++++++++++++++++
+------------------
 
-**Improvements and Bug Fixes**
+Improvements and bug fixes
+^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-- **breaking change** Major changes in the TLV structure and classes. Reduced codebase size and
-  improved compilation times. LSA de/serialize functions are replaced by wireEncode/Decode. Updated LSA
-  wire formats and TLV assignments. Updated nlsrc to print using the new encoding. (:issue:`4787`, :issue:`5116`)
+- *(breaking change)* Major changes in the TLV structure and classes. Reduced codebase size and
+  improved compilation times. LSA de/serialize functions are replaced by wireEncode/Decode.
+  Updated LSA wire formats and TLV assignments. Updated nlsrc to print using the new encoding.
+  (:issue:`4787`, :issue:`5116`)
 - LSDB refactor: switch to ``boost::multi_index`` to replace 3 LSA lists (:issue:`4127`)
 - Fix wrong reaction on hello Interest timeout (:issue:`5139`)
diff --git a/docs/releases.rst b/docs/releases.rst
index 39b1403..96ed2ea 100644
--- a/docs/releases.rst
+++ b/docs/releases.rst
@@ -1,5 +1,5 @@
 NLSR Versions
-+++++++++++++
+=============
 
 .. toctree::
    :glob: