docs: move usage guides to usage/, add quickstart and porting

docs/source/usage/install.md

@@ -0,0 +1,32 @@
+# Installation
+
+1. Install Python 3, Docker, and git.
+
+   On Arch: `pacman -S python docker git --needed --noconfirm`
+
+   ```{Hint}
+   After installing Docker you will have to add your user to the `docker` group:
+
+   `sudo usermod -aG docker "$(whoami)"`
+
+   Then restart your desktop session for the new group to take effect.
+   ```
+
+2. Pick which Kupferbootstrap branch to clone: usually either `main` or `dev`
+
+3. Clone the repository: `git clone -b INSERT_BRANCHNAME_HERE https://gitlab.com/kupfer/kupferbootstrap`
+
+4. Change into the folder: `cd kupferbootstrap`
+
+5. Install python dependencies: `pip3 install -r requirements.txt`
+
+   ```{Note}
+   Most of our python dependencies are available as distro packages on most distros,
+   sadly it's incomplete on Arch.
+
+   See `requirements.txt` for the list of required python packages.
+   ```
+
+6. Symlink `kupferbootstrap` into your `$PATH`: `sudo ln -s "$(pwd)/bin/kupferbootstrap" /usr/local/bin/`
+
+7. You should now be able to run `kupferbootstrap --help`!