Improve GStreamer Release Process Documentation
More fully documenting our current release process will make it easier to optimize how we release GStreamer and also easier to share some of the tasks with those in the community who are interested.
I've taken an old release document from random, removed references to CVS and Fresh Meat, and
added some up-to-date references to Gitlab and meson, but it is still really out of date.
As this is just the tip of the iceberg, if anyone (cough !!! ... Tim) has any scripts they can share
or any other steps they can add, please feel free.