Add admin dashboard and Pocket ID auth notes

docs/ADMIN.md

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+# FamilyFed.ie admin notes
+
+The admin dashboard is generated at `/admin/index.html`. To make
+`https://admin.familyfed.ie/` show the dashboard, configure the web server or
+reverse proxy for that hostname to serve `dist/admin/index.html` as its root
+document.
+
+Protect `admin.familyfed.ie` at the web server, reverse proxy, or hosting layer
+with Pocket ID authentication. Require the Pocket ID user group
+`familyfed_admin`. The generated page has `noindex`, but a static page cannot
+enforce a secure admin login by itself.
+
+See `docs/POCKET-ID-AUTH.md` for the exact proxy/auth requirements.
+
+## Content changes
+
+- Calendar events live in `src/data/events.ts`.
+- Speeches live in `content/speeches/<year>/<slug>.md`.
+- The admin page includes builders that generate valid snippets/files for both.
+
+Because this is a static Astro site, the browser cannot securely write content
+back into the repository by itself. Commit generated content changes to the
+repository and deploy as usual.
+
+## Contact form
+
+Set `PUBLIC_CONTACT_FORM_ENDPOINT` during the build to make the contact form
+send real submissions through a hosted form provider such as Formspree, Basin,
+Getform, or a self-hosted endpoint.
+
+Optional variables:
+
+- `PUBLIC_CONTACT_RECIPIENTS`: comma-separated mail fallback recipients.
+- `PUBLIC_CONTACT_SUBMISSIONS_URL`: admin dashboard URL for form submissions.
+
+If no endpoint is configured, the form falls back to opening the visitor's email
+application with the message filled in.
+
+For deployment, add the matching variables as Forgejo secrets. The deploy
+workflow passes them into the Astro build.
+
+## Analytics
+
+Set `PUBLIC_PLAUSIBLE_DOMAIN=familyfed.ie` to load Plausible analytics on the
+public site. If using a self-hosted Plausible instance, set
+`PUBLIC_PLAUSIBLE_SCRIPT_SRC` to the script URL.
+
+Set `PUBLIC_ANALYTICS_DASHBOARD_URL` to the analytics dashboard URL so the admin
+page can link directly to visitor reports.