This will make it easier for prospective users and developers to
locate the mailman lists.

Update links and place the description further away in time;
this codec isn't widely used any more.

This is more readable on the gitlab/github landing pages.

svn path=/trunk/theora/; revision=17823

svn path=/trunk/theora/; revision=17465

svn path=/trunk/theora/; revision=17464

This will be the basis of the 1.2.x releases.

svn path=/trunk/theora/; revision=17445