Add "Get farmOS, "Develop farmOS", and "Follow farmOS" headers and links to homepage

[mstenta]

This add a bunch of links to the homepage, based on feedback we've heard from the community. It also adds 3 <h2> headers to organize everything:

• Get farmOS
• Develop farmOS
• Follow farmOS

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[wotnak]

Looks good, although I'm not sure if the repositories list is really needed on the homepage. It pushes the 'Follow farmOS' section down, and Github org with all repos is already linked right above it. Maybe a better place to list important git repos would be in the Github org README.

[mstenta]

For what it's worth, part of the motivation for adding the repositories was related to: #22 (comment)

[mstenta]

I agree that visitors can find the repositories if they need to, but another reason to include them on the homepage (IMO), is for emphasis to non-developers. I think there is a positive psychological effect to a farmer or other non-developer visiting farmOS.org for the first time to see the list of code repos, which gives a sense that this is a "real" project with multiple pieces that many people are working on. I don't have anything to base that on, just a sense... :-)

If there's consensus that it isn't necessary or is detrimental to include them, I'm happy to remove that commit and we can find another place to put direct links to repos in farmOS.org.

[mstenta]

Forgot about this PR!

Looking at it with fresh eyes, I agree with @wotnak's comment, so I removed the individual repository links.

Rebased and force pushed. Ready for review again. :-)

[wotnak]

there's no url set for this link

[mstenta]

Thanks @wotnak! Fixed and force pushed.