Add section on communities

[gagdiez]

Most of our community is in Telegram, where we have a couple of active channels fuzzing everyday with devs.

We need to port the "communities" page from DevHub, stripe it down from all the social features, and leave it only as pages with some information and a huge "join the community" button

We might actually want to merge both support and communities into a single page, were people can discover:

• the NEAR DEV channel
• some curated channels (e.g. chain abstraction, BOS developers, tools, build dao, etc)
• our discord