Update Dashboard (#525)

* Update Dashboard.md

Updated CVA6 status.
Moved PA projects to a dedicated table.
Fixed broken links (as /Project Descriptions and Plans/ was renamed to /Project-Descriptions-and-Plans/)

* Update Dashboard.md

Reverted from /tree/ to /blob/ in folder names

* Update Dashboard.md

Fixing "https://github.com/openhwgroup/core-v-docs/blob/master/program/Project-Descriptions-and-Plans" path

* Update Dashboard.md

One more fix

* Update program/dashboard/Dashboard.md

Thanks for the correction!

Co-authored-by: DBees <duncan@openhwgroup.org>

Co-authored-by: DBees <duncan@openhwgroup.org>