docs: add sphinx docs and gitlab pages

docs/source/install.rst

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+############
+Installation
+############
+
+
+#.
+  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 "$(whoami)"``
+
+      Then restart your desktop session for the new group to take effect.
+
+#. Pick which Kupferbootstrap branch to clone: usually either ``main`` or ``dev``
+
+#. Clone the repository: ``git clone -b INSERT_BRANCHNAME_HERE https://gitlab.com/kupfer/kupferbootstrap``
+
+#. Change into the folder: ``cd kupferbootstrap``
+
+#.
+  Install python dependencies: ``pip3 install -r requirements.txt``
+
+  .. Note::
+      Most of our python dependencies are available as distro packages on most distros,
+      sadly it's incomplete on Arch.
+
+      See ``requirements.txt`` for the list of required python packages.
+
+#. Symlink ``kupferbootstrap`` into your ``$PATH``: ``sudo ln -s "$(pwd)/bin/kupferbootstrap" /usr/local/bin/``
+
+#. You should now be able to run ``kupferbootstrap --help``!