Restructure README.md into the canonical section set (closes #11)

REPO_POLICIES.md mandates a fixed set of README sections; this README
predated the standard being applied here and had About / Contributing /
Technical Details / Entrypoints / License instead. It is now a
Description first line followed by Getting Started, Entrypoints,
Rationale, Design, TODO, License, Author, with Author last.

Nothing the old headings held was dropped: the list of what the site
publishes moved under the Description, and the contribute contact and
the local-preview instructions moved into Getting Started.

Getting Started was written against the current Makefile rather than
carried over from the old prose, which had drifted. There is no
`make build` target, so the old "Build: `hugo`" instruction is now
`make test`; "Local Development: `hugo server`" is now `make setup`
then `make serve`, and `make setup` is what makes a fresh clone
buildable at all since it installs the pinned Hugo.

Two stale claims are fixed. The site is deployed by Gitea Actions to
Cloudflare Pages, not "automatically via GitHub Actions". And the
Entrypoints bullet for `script/fmt` still described the
top-level-markdown-only scope that #12 replaced with `'**/*.md'` and
`'**/*.css'`; the rest of that section was verified accurate against the
scripts, including the `script/check` order and the `CHECK_EPOCH` guard
that makes a bare `docker build .` fail closed.

The License section body is deliberately untouched and no LICENSE file
is added: that is #10's, which is blocked on the owner's choice of
license. For the same reason the Description sentence omits the license
clause the policy asks for; #10 completes both.

The Design section's claims were checked against the tree rather than
assumed: the vendored theme, the `readFile` inline of style.css in
baseof.html, the `hugo --minify` output to `public/`, and the deploy
workflow.

README.md

@@ -1,43 +1,49 @@
 # lora.vegas
 
-Las Vegas Meshtastic and LoRa community website.
+`lora.vegas` is the website of the Las Vegas Meshtastic and LoRa community: a
+single-page static site, built with Hugo, by [@sneak](https://sneak.berlin).
 
-## About
-
-This site provides information about the Las Vegas mesh networking community,
-including:
+It publishes what the local mesh needs in one linkable place:
 
 - Mesh channel configurations
-- Community coordination (Discord, Signal)
+- Community coordination links (Discord, Signal)
 - Meetup information
 - Local resources
 
-## Contributing
+## Getting Started
+
+From a fresh clone, `make setup` installs every build dependency (git, make, go,
+the pinned Hugo, node/npm) and the git pre-commit hook, and `make serve` starts
+the Hugo development server:
+
+```bash
+git clone git@git.eeqj.de:sneak/lora.vegas.git
+cd lora.vegas
+make setup
+make serve
+```
+
+Then open <http://localhost:1313> to preview the site.
+
+To produce the production build, which writes the rendered site to `public/`:
+
+```bash
+make test
+```
+
+Before committing, run the full check suite — the production build, the lint
+build, and the formatting check:
+
+```bash
+make check
+```
+
+`make fmt` rewrites the repo's markdown and CSS to the project's prettier
+settings; run it if `make check` fails on formatting.
 
 To contribute to this site, contact **sneak@sneak.berlin** for git repository
 access.
 
-## Technical Details
-
-This is a static site built with Hugo. The site is deployed automatically via
-GitHub Actions.
-
-### Local Development
-
-```bash
-hugo server
-```
-
-Visit http://localhost:1313 to preview.
-
-### Build
-
-```bash
-hugo
-```
-
-Output will be in the `public/` directory.
-
 ## Entrypoints
 
 This repository adheres to the
@@ -55,7 +61,8 @@ provide:
 - `script/test` — the correctness check: a clean `hugo --minify` production
   build
 - `script/lint` — a clean build that surfaces broken links and path collisions
-- `script/fmt` — format the repo's own top-level markdown docs with prettier
+- `script/fmt` — format every markdown and CSS file in the repo with prettier;
+  the exclusions live in `.prettierignore` with the reason for each
 - `script/fmt-check` — check that formatting (read-only)
 - `script/check` — run `script/test`, `script/lint`, then `script/fmt-check`;
   modifies no tracked files
@@ -72,6 +79,38 @@ green it did not earn. A bare `docker build .` fails closed on the Dockerfile's
 
 A convenience `make serve` target runs `hugo server` for local preview.
 
+## Rationale
+
+The Las Vegas Meshtastic and LoRa community needs one durable, linkable place
+for its channel configurations and group links. Those details otherwise live
+inside a Discord or Signal thread, where they scroll away, cannot be linked to
+from outside, are invisible to anyone who has not already joined, and quietly go
+stale. A static site at a stable domain is the opposite of that: one URL to hand
+to a newcomer, and one place to correct when a channel changes.
+
+## Design
+
+The site is a single page. All of its content is one Hugo content file,
+`content/_index.md`, rendered by a minimal theme vendored in-repo at
+`themes/loravega/` — there is no upstream theme dependency and no submodule.
+
+The theme's `layouts/_default/baseof.html` inlines
+`themes/loravega/static/css/style.css` into a `<style>` block with Hugo's
+`readFile`, so the whole site ships as a single HTML document with no external
+CSS request and no second round trip.
+
+`hugo --minify` builds the site into `public/`. Deployment is automatic: on push
+to `main`, the Gitea Actions workflow `.gitea/workflows/deploy.yml` builds the
+site and publishes `public/` to Cloudflare Pages.
+
+## TODO
+
+The live task list is in [TODO.md](TODO.md).
+
 ## License
 
 Content is provided as-is for community use.
+
+## Author
+
+[@sneak](https://sneak.berlin)