link to forum on main page

[chaseadam]

Forum is not mentioned on ubports.com. Found the telegram group and membership application.

I discovered the forum through a reference in github issues.

[hummlbach]

ubports.com->community->forum
not sure, how to make it more prominently...

[advocatux]

Forum is not mentioned on ubports.com

@chaseadam yes, it is but any idea to make it more prominent is welcome