docs: add badges to README, update various URLs

And remove reference to inaccessible video

Change-Id: I3ea826ac393847226d760002d700ae1ee648ff71
diff --git a/README.md b/README.md
index 187f02d..9508779 100644
--- a/README.md
+++ b/README.md
@@ -1,32 +1,35 @@
-Mini-NDN
-========
+# Mini-NDN
 
-If you are new to the NDN community of software generally, read the
-[Contributor's Guide](https://github.com/named-data/.github/blob/master/CONTRIBUTING.md).
+![Latest version](https://img.shields.io/github/v/tag/named-data/mini-ndn?label=Latest%20version)
+[![Docker](https://github.com/named-data/mini-ndn/actions/workflows/docker.yml/badge.svg)](https://github.com/named-data/mini-ndn/actions/workflows/docker.yml)
 
 ### What is Mini-NDN?
 
 Mini-NDN is a lightweight networking emulation tool that enables testing, experimentation, and
 research on the NDN platform based on [Mininet](https://github.com/mininet/mininet).
 Mini-NDN uses the NDN libraries, NFD, NLSR, and tools released by the
-[NDN project](http://named-data.net/codebase/platform/) to emulate an NDN network on a single system.
+[NDN project](https://named-data.net/codebase/platform/) to emulate an NDN network on a single system.
 
-Mini-NDN is open and free software licensed under the GPL 3.0 license. Mini-NDN is free to all
-users and developers. For more information about licensing details and limitations,
-please refer to [COPYING.md](COPYING.md).
+Mini-NDN is free and open source software distributed under the GNU General Public License version 3.
+For more information about licensing details and limitations, please refer to [`COPYING.md`](COPYING.md).
 
 The first release of Mini-NDN is developed by members of the NSF-sponsored NDN project team.
-Mini-NDN is open to contribution from the public.
-For more details, please refer to [AUTHORS.rst](AUTHORS.rst).
+For more details, please refer to [`AUTHORS.rst`](AUTHORS.rst).
 Bug reports and feedback are highly appreciated and can be made through our
-[Redmine site](http://redmine.named-data.net/projects/mini-ndn) and the
-[mini-ndn mailing list](http://www.lists.cs.ucla.edu/mailman/listinfo/mini-ndn).
+[Redmine site](https://redmine.named-data.net/projects/mini-ndn) and the
+[mini-ndn mailing list](https://www.lists.cs.ucla.edu/mailman/listinfo/mini-ndn).
+
+Mini-NDN is open to contribution from the public.
+If you are new to the NDN software community and intend to contribute to the codebase, please read our
+[Contributor's Guide](https://github.com/named-data/.github/blob/main/CONTRIBUTING.md).
 
 ### Documentation
 
-Please refer to http://minindn.memphis.edu/ for installation, usage, and other documentation.
+Please refer to <https://minindn.memphis.edu/> for installation, usage, and other documentation.
 The documentation can also be built locally using:
 
-    ./docs/build.sh
+```shell
+./docs/build.sh
+```
 
 and is available under `docs/_build/html`.