docs: make Supported Operations container collapsible

[shiftinv]

Summary

Makes the "Supported Operations" container element in the documentation collapsible (example), and collapses it by default to reduce clutter (especially in flag classes, which have about a dozen operations each).

old vs. new:

Checklist

• If code changes were made, then they have been tested
  • I have updated the documentation to reflect the changes
  • I have formatted the code properly by running pdm lint
  • I have type-checked the code by running pdm pyright
• This PR fixes an issue
• This PR adds something new (e.g. new method or parameters)
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)