[Catalog] Add visuals to games catalog

[edwardchalstrey1]

This feature request is for...

PyGambit

Requested enahancement or feature

In #753 we have added the Catalog of games. Each game is listed in a table on the "Catalog of games" page of the docs.
To help people reading the documentation understand the games, we could add visuals of the games to these pages.

• Draw all the EFG games in the catalog with draw_tree
  • One approach could be to run draw_tree when building the docs, could be slow
  • Another approach could be to have the update_catalog.py generate the images and put them in a folder which catalog.yml loads from
• Open and complete any issues for draw_tree that need to be fixed for a large set of the Catalog games to look good
• Release new draw_tree version and use it in Gambit: 0.4 https://github.com/gambitproject/draw_tree/issues?q=is%3Aissue%20state%3Aopen%20milestone%3A0.4.0
• Can we also visualise NFGs via printing the table in the docstring?