init: astro publish site with newsletter, search, and actions workflow

deploy/Caddyfile.example

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+# Replace with your domain
+example.com {
+  root * /var/www/publish
+  encode zstd gzip
+  file_server
+}

deploy/README.md

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+# Server deploy (static)
+
+This repo builds an Astro static site into `dist/` and deploys it to a Linux server via rsync over SSH.
+
+## One-time server setup
+
+1. Create a deploy directory, e.g. `/var/www/publish`.
+2. Configure your web server (Caddy or Nginx) to serve that directory.
+3. Create an SSH key for CI and add its public key to the server.
+
+## Gitea Actions secrets (repo settings)
+
+- `SITE_URL`
+- `PUBLIC_NEWSLETTER_ACTION`
+- `PUBLIC_NEWSLETTER_EMAIL_FIELD`
+- `PUBLIC_NEWSLETTER_TITLE` (optional)
+- `PUBLIC_NEWSLETTER_DESCRIPTION` (optional)
+- `DEPLOY_SSH_HOST`
+- `DEPLOY_SSH_PORT`
+- `DEPLOY_SSH_USER`
+- `DEPLOY_PATH`
+- `DEPLOY_SSH_KEY` (private key)
+
+## Example Caddyfile
+
+See `deploy/Caddyfile.example`.