Fix broken links and formatting on the sample games page (#2562)

* Fix broken links in community games page

* Fix duplicate target names

* Crop large blank transparent area from PyOverheadGame screenshot

* Put genre and authorship info below heading for most (non-multiple) headings

* Show target site in external links (GitHub, itch, etc)

* Fix tabs vs spaces

* Remove dead link for one game (Kayzee was deleted / set to private by the author)

Author: pushfoo