* Remove the unneeded pytest options from pyproject.toml
* Clean up setup.py from old readthedocs.org workaround
* Removes unused folder
* Simplify list of excluded files in black's configuration
* Fix returned exit codes in `make.ps1`
* Add Sublime's project files to `.gitignore`
* Update the link to Black in README and contributing guidelines
Vendor `discord.ext.menus` from commit `cc108bed812d0e481a628ca573c2eeeca9226b42` at https://github.com/Rapptz/discord-ext-menus
Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>