Truncate long game descriptions, and hide full games, on front page

[philcampeau]

Fixes #10006
Fixes #8658

Before clicking "Create"

• Branch is derived from the latest master
• Add the pins or archive_alpha_games label if this change will break existing games
• Code passes linter with docker compose exec rack rubocop -a
• Tests pass cleanly with docker compose exec rack rake

Implementation Notes

Explanation of Change

Truncates long game descriptions on the front page, with a 'Show more' text to expand the description upon request.

Screenshots

Before:

After:

Any Assumptions / Hacks

[philcampeau]

Updated this to add a Short Desc. button in the Filters section instead of a checkbox. This also modifies the URL allowing people to bookmark that setting on.

[philcampeau]

I've also added a commit that would add another Filter button to hide full games from the New Games list.

Here's the section at the bottom:

both new buttons modify the url, so they can be bookmarked.