#48in24: Meetup 2024-08-20 and PHP is a featured language

[mk-mxp]

Meetup will be the only exercise with PHP as featured language during #48in24! Let's prepare it well:

• Run bin/configlet sync -u -e meetup (updates the Markdown files and maybe tests.toml)
  • docs: instructions unsynced: meetup
  • metadata: unsynced: meetup
• Drop strict types comments from test file and example code (these are useless)
• Add and sync test meta data to tests (uuid / @testdox in DocBlocks)
• Decide on adding / adjusting / ordering test cases to match current problem specs

Do not redesign the student's interface or add test cases that would invalidate existing community solutions. These are extra tasks, which should be discussed in advance.

In addition to the other sync-ing tasks, consider doing these:

• Polish the tests to be really readable (e.g. add failure messages to assertions)
• Replace <link> in comment on strict types #617
• Go through the track docs and update installation instructions, help resources etc.
• Add approaches and articles