[isabelle-dev] Isabelle/Phabricator project tags

[Makarius]

A young student has recently shown me "Kanban boards" (or "Trello boards"), so
I have updated the existing project tags on Isabelle/Phabricator slightly,
notably https://isabelle-dev.sketis.net/tag/isabelle-release and
https://isabelle-dev.sketis.net/tag/provers

This is only a small part of the actual TODO list for the release, but it
might help in overall communication and coordination.

(I don't want to spend to much time on publicly visible activity, or rather
"agility" just to look cool.)


	Makarius