8.5
docs: Fix typo in gitlab callback url in dev setup instructions.
docs: Rename setup-vagrant.md -> setup-recommended.md.
docs: Document and advocate systemd for WSL 2.
docs: Update devlogin screenshot and url in development setup.
docs: Use MyST syntax for Sphinx metadata.
install: Support Ubuntu 24.04.
Remove Ubuntu 18.04 support.
models: Rename zerver/models.py to zerver/models/__init__.py.