chore(docs): update doc structure for site refresh (#895)

This PR changes the docs structure to reflect the updated site
architecture.

- ADRs moved to a separate folder
- All docs are served out of `docs/reference` (or possibly
`docs/troubleshooting` if added)
- Remove unnecessary front matter as needed

N/A

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [X] Other (security config, docs update, etc)

- [ ] Test, docs, adr added or updated as needed
- [ ] [Contributor
Guide](https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md)
followed

---------

Co-authored-by: Micah Nagel <[email protected]>

docs/reference/UDS Core/prerequisites.md

@@ -1,7 +1,5 @@
 ---
-title: Prerequisites
-sidebar:
-    order: 2
+title: UDS Core Prerequisites
 ---
 
 `UDS Core` can run in any [CNCF conformant Kubernetes distribution](https://www.cncf.io/training/certification/software-conformance/), but sometimes customizations are needed based on environments. This is an attempt to document and link to relevant information to aid in setting up your Kubernetes environment and hosts to ensure a successful `UDS Core` installation.