docs: add "About this repo" intro to README

Explain the project's origin — years of personal infra notes and scripts,
polished with Claude into a consistent, multi-distro toolkit — and note that
more is still being added from the collection. Framed as a starting point for
friends to use and extend. PRs and ideas welcome.

README.md

@@ -6,6 +6,14 @@ Alma Linux** (every distro difference is gated in
 [`scripts/oslib.sh`](scripts/oslib.sh)); each Docker stack runs behind Caddy
 with automatic Let's Encrypt TLS, orchestrated with Docker Compose.
 
+> **About this repo.** This started as years of personal notes and one-off
+> scripts I'd accumulated running my own infrastructure. I worked with Claude
+> to clean them up, make them consistent and multi-distro, and add some
+> quality-of-life options — so friends can use them too, and build on them.
+> I'm still working through my collection and adding more as I go, so expect
+> this to keep growing. Treat it as a starting point: fork it, wire in your own
+> domains/keys, and send improvements back. PRs and ideas welcome.
+
 ## One command to run anything
 
 ```bash