docs: add badges to README, update various URLs

And remove reference to inaccessible video

Change-Id: I3ea826ac393847226d760002d700ae1ee648ff71
diff --git a/docs/index.rst b/docs/index.rst
index 18ae23e..7175a28 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -1,8 +1,3 @@
-.. Mini-NDN documentation master file, created by
-   sphinx-quickstart on Mon Sep 23 11:15:54 2019.
-   You can adapt this file completely to your liking, but it should at least
-   contain the root `toctree` directive.
-
 Mini-NDN: A Mininet-based NDN emulator
 ======================================
 
@@ -23,9 +18,9 @@
 Helpful Links
 -------------
 
-* `NDN Website <http://named-data.net/>`_
-* `NDN Contributor's Guide <https://github.com/named-data/NFD/blob/master/CONTRIBUTING.md>`_
-* `Mininet Documentation <http://mininet.org/>`_
-* `Mini-NDN redmine <https://redmine.named-data.net/projects/mini-ndn>`_
-* `Mailing list <http://www.lists.cs.ucla.edu/mailman/listinfo/mini-ndn>`_
+* `NDN Website <https://named-data.net/>`__
+* `NDN Contributor's Guide <https://github.com/named-data/.github/blob/main/CONTRIBUTING.md>`__
+* `Mininet Documentation <https://mininet.org/>`__
+* `Mini-NDN redmine <https://redmine.named-data.net/projects/mini-ndn>`__
+* `Mailing list <https://www.lists.cs.ucla.edu/mailman/listinfo/mini-ndn>`__
 * :doc:`Mini-NDN Team <authors>`