renamed old 'email' page to 'community'

- preparation for adding more content to this page later.
Content update for Community Page

- rename to "Community Network"
- Added some other pages, that provide content about JACK
renamed email site to "Community Network"

- preparation for a change of the site structure
Redo change of link to wiki of jack1 vs jack2

- added change to .md file
- regenerated all pages