Contrib modules/projects listing page

[wotnak]

This pr adds a page that list contrib modules/projects listed in https://github.com/wotnak/farmos-community-projects.
The goal of this is to improve discoverability of farmOS v2 addons/integrations.

Related discussion on the forum: https://farmos.discourse.group/t/contrib-modules-tools-list/1531

Before merging this:

• projects.json file, which this page reads data from, should have defined schema Define projects.json schema wotnak/farmos-community-projects#2
• decision on what is considered a contrib vs custom module should be made
  • main question is if only modules published to drupal.org should be considered contrib or other modules that have general enough approach and are published for example only on github should also be included
• projects list repo probably should be moved to the farmOS github org
• page name and placement in the site menu should be reviewd
  • currently I named it analogous to the repo with the projects list, but maybe naming it Addons and placing it under Hosting menu section would make it more easily discoverable

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[mstenta]

Thanks for getting this started @wotnak! I added some thoughts to the forum thread that I would like to think through before moving forward with this - mostly around organizing the list and setting expectations: https://farmos.discourse.group/t/contrib-modules-tools-list/1531/7

In general I love this effort!