docs: cleanup, remove stale material

Point https://fd.io/docs/vpp/master/links/index.html at docs.fd.io/vpp
instead of at one specific stale release

Remove https://fd.io/docs/vpp/master/featuresbyrelease/index.html

Remove https://fd.io/docs/vpp/master/events/index.html

Remove dead projects from
https://fd.io/docs/vpp/master/relatedprojects/index.html

Remove unsupported distros from
https://fd.io/docs/vpp/master/whatisvpp/supported.html

Reduce (doxygen) list of test framework doc files to actively
supported releases

Type: docs

Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: I179966fbbe09ac123e5f2647787a8dea93190b5c
diff --git a/docs/whatisvpp/supported.rst b/docs/whatisvpp/supported.rst
index b201def..a9390cc 100644
--- a/docs/whatisvpp/supported.rst
+++ b/docs/whatisvpp/supported.rst
@@ -18,14 +18,12 @@
 Operating Systems and Packaging
 -------------------------------
 
-FD.io VPP supports package installation on the following 
-recent LTS operating systems releases:
+FD.io VPP supports package installation on the following
+recent LTS releases:
 
-* Operating Systems:
+* Distributions:
 
    * Debian
-   * Ubuntu 
-   * CentOS 
-   * OpenSUSE
+   * Ubuntu
 
 For more about VPP performance press next.