Add deployment pipeline and clean up repo

- Add Dockerfile, docker-compose.yml, .dockerignore, .env (port 3842)
- Add Caddyfile.snippet for analytics gateway import pattern
- Add .gitea/workflows/deploy.yaml for act_runner SSH deploy
- Untrack sensitive/data files (SCPA xlsx, owners.rds)
- Add renv lockfile and infrastructure files
- Reorganize data-raw scripts and add SarasotaCounty boundary data
- Move www assets to www/images/, add docs PDFs

Caddyfile.snippet

@@ -0,0 +1,5 @@
+# stAndrews — port 3842
+redir /stAndrews /stAndrews/ 308
+handle_path /stAndrews/* {
+    reverse_proxy 127.0.0.1:3842
+}