download.tuxfamily.org has been down for months now, due to a datacenter
failure. It may not go back up again as per this forum post:
https://forum.tuxfamily.org/post/3383/
Some download links are still broken as their files haven't been uploaded
to the godot-builds releases, especially for old pre-releases like 3.0.alpha1.
TuxFamily still hosts the asset library, so the privacy policy and
education pages are unchanged.
This also removes links to op.godotengine.org which has been long defunct.
This PR replaces the current CMS website with a static version of it built using Jekyll.
- Everything should be working 1 to 1 with the same permalinks except for the `/news` page (not articles) which was renamed as `/blog` (old links will redirect to new ones).
- The showcase entries on the home page now redirect to their showcase page in our site so that the user can choose which store front or page to visit next.
- I also changed the first link from the nav bar to go to the showcase page since the features one is still pretty outdated.
Co-authored-by: Yuri Sizov <yuris@humnom.net>