chore: Remove redundant commands

[Nydauron]

Description

Removes the following commands:

• /alumni
• /division
• /games
• /pronouns
• /states

All of these commands are superseded by Discord's onboarding survey. Users can select their events, their state, their division, and any additional channels through the survey. These preferences are then saved and persist even when the user decides to leave and rejoin at a later date.

This coincides with the same reason why the /events command was removed in #8.

Checks

• I ran black over the code to ensure formatting.
• I added docstrings to any new modules, classes, and methods.
• I updated the docstrings of any updated modules, classes, and methods.
• I added/updated Python typings for any new/updated class and module.
• I updated the bot version (if necessary).
• I ran mypy and reviewed any shown errors related to my changes.

Important Info

• This pull request adds new pip dependencies.
• This pull request adds new external dependencies.
• This pull request changes the required versions of some dependencies.

Issues Closed

My pull request closes the following issues:
N/A

Thank You

Thank you for your contribution to Scioly.org! This pull request will be reviewed
in a promptly manner. If not done, please feel free to contact @cbrxyz.

[Nydauron]

👍