[community] Community projects webpage

Hi, last week we received a great pull request[1] to fix the ticket #16576[2]. Basically, it creates a 'Community' menu in the main portal with other software projects developed by the community, like Onionshare.

Although in our new community portal we will have more content, I think it's a good addition to our current website and should be merged.

Please let us know what do you think. :)

cheers, Gus

[1] https://github.com/torproject/webwml/pull/38 [2] https://trac.torproject.org/projects/tor/ticket/16576