I'll private-message you a few ideas ngawang.
I like Andrew's planet idea. And I agree with MB and ssd; Trisquel.info is
an obvious place for this kind of info.
But you seem motivated to make your own site, so I think you should go for
it. Getting a small team together, choosing topics, and building a
community. It sounds like fun. And you may have more freedom about how you
approach things, than if you pursue this through the official Trisquel site.
The contributers should choose a free license for the work. Like the GFDL.
This way, the Trisquel community can adapt (or adopt) relevant parts for this
site's official documentation.