refactor: remove extensions

[VincentRPS]

Summary

fixes #204

Information

• 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, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have updated the changelog to include these changes.

[pycord-app]

Thanks for opening this pull request!
Please make sure you have read the Contributing Guidelines and Code of Conduct.

This pull request can be checked-out with:

git fetch origin pull/217/head:pr-217
git checkout pr-217

This pull request can be installed with:

pip install git+https://github.com/Pycord-Development/pycord-next@refs/pull/217/head

[Paillat-dev]

Stuff is breaking vincentttttt

[read-the-docs-community]

Documentation build overview

📚 pycord-next | 🛠️ Build #30839775 | 📁 Comparing 5d570a7 against latest (d655562)

🔍 Preview build

Show files changed (38 files in total): 📝 15 modified | ➕ 0 added | ➖ 23 deleted

File	Status
cogs.html	📝 modified
faq.html	📝 modified
genindex.html	📝 modified
index.html	📝 modified
migrating_to_v1.html	📝 modified
migrating_to_v2.html	📝 modified
old_changelog.html	📝 modified
quickstart.html	📝 modified
_modules/index.html	📝 modified
api/abcs.html	📝 modified
api/application_commands.html	📝 modified
api/clients.html	📝 modified
api/cogs.html	📝 modified
api/exceptions.html	📝 modified
_modules/discord/cog.html	📝 modified
ext/bridge/api.html	➖ deleted
ext/bridge/index.html	➖ deleted
ext/commands/api.html	➖ deleted
ext/commands/cogs.html	➖ deleted
ext/commands/commands.html	➖ deleted
ext/commands/extensions.html	➖ deleted
ext/commands/index.html	➖ deleted
ext/pages/index.html	➖ deleted
ext/tasks/index.html	➖ deleted
_modules/discord/ext/tasks.html	➖ deleted
_modules/discord/ext/bridge/bot.html	➖ deleted
_modules/discord/ext/bridge/context.html	➖ deleted
_modules/discord/ext/bridge/core.html	➖ deleted
_modules/discord/ext/commands/bot.html	➖ deleted
_modules/discord/ext/commands/cog.html	➖ deleted
_modules/discord/ext/commands/context.html	➖ deleted
_modules/discord/ext/commands/converter.html	➖ deleted
_modules/discord/ext/commands/cooldowns.html	➖ deleted
_modules/discord/ext/commands/core.html	➖ deleted
_modules/discord/ext/commands/errors.html	➖ deleted
_modules/discord/ext/commands/flags.html	➖ deleted
_modules/discord/ext/commands/help.html	➖ deleted
_modules/discord/ext/pages/pagination.html	➖ deleted

[Paillat-dev]