Add GH Pages infrastructure

Start to migrate from README.md to the Pages infrastructure
for nicer looking and more organized docs.

docs/install.md

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+# Trying out development builds
+
+---
+nav_order: 2
+---
+
+<!--
+## Booting directly from KVM guest image
+
+There's a provisional KVM guest image uploaded here:
+
+<https://fedorapeople.org/~walters/cloud-init-base-eln-20231029.qcow2.zst>
+
+You can run it using e.g. [virt-install](https://github.com/virt-manager/virt-manager/blob/main/man/virt-install.rst#--cloud-init)
+and in general all the same techniques that work the Fedora Cloud Base or the
+RHEL KVM guest image.
+
+Once you've booted this, use e.g. `bootc update` to fetch updates.
+-->
+
+## Rebasing from Fedora CoreOS
+
+[Fedora CoreOS](https://docs.fedoraproject.org/en-US/fedora-coreos/) supports
+many different platforms, and can be used as a starting point to "rebase" to a
+custom derived image from CentOS boot.
+
+```shell
+systemctl mask --now zincati && rm -vf /run/ostree/staged-deployment-locked
+echo "# dummy change" >> "/etc/sudoers.d/coreos-sudo-group"
+rpm-ostree rebase ostree-unverified-registry:quay.io/centos-boot/fedora-tier-1:eln
+systemctl reboot
+```
+
+See also [this pull request][1] for more information.
+
+## TODO: Use osbuild
+
+Document the ongoing work to materialize a disk image from a container.
+
+## Using `bootc install-to-filesystem --replace=alongside` with a cloud image
+
+A toplevel goal of this project is that the "source of truth" for Linux
+operating system management is a container image registry - as opposed to e.g. a
+set of qcow2 OpenStack images or AMIs, etc.
+
+The latest development builds of `bootc` have support for
+`bootc install-to-filesystem --replace=alongside`.  More about this core
+mechanic in the [bootc install docs](https://github.com/containers/bootc/blob/main/docs/install.md).
+
+Here's an example set of steps to execute; this could be done via e.g.
+[cloud-init](https://cloudinit.readthedocs.io/en/latest/reference/index.html)
+configuration.
+
+```shell
+dnf -y install podman skopeo
+podman run --rm --privileged --pid=host -v /:/target --security-opt label=type:unconfined_t quay.io/centos-boot/fedora-tier-1:eln bootc install-to-filesystem --target-no-signature-verification --karg=console=ttyS0,115200n8 --replace=alongside /target
+reboot
+```
+
+## Generating a derived container image
+
+These examples just use a "stock" container image, and in the first case rely on
+user state being preserved by the `rpm-ostree rebase`.
+
+What's much more interesting is to generate a custom derived container image,
+and target that instead.  For more information, see
+
+- <https://github.com/coreos/layering-examples>
+- <https://github.com/openshift/rhcos-image-layering-examples>
+
+[1]: https://github.com/coreos/fedora-coreos-docs/pull/540