Add repo hygiene rules and ignore secrets

.gitignore

@@ -0,0 +1,36 @@
+# Env / Secrets
+.env
+.env.*
+!.env.example
+
+# Dependencies
+/vendor
+/node_modules
+/server/vendor
+
+# PHPUnit / cache / runtime
+/server/.phpunit.cache
+/server/storage
+/server/logs
+
+# Build artifacts / caches
+/web/**/public/cache
+/web/**/public/build
+/web/**/public/dist
+
+# Docker / DB data
+**/data
+**/db-data
+**/postgres-data
+*.sqlite
+*.db
+*.dump
+*.sql
+!/server/db/migrations/*.sql
+
+# IDE / OS
+.DS_Store
+Thumbs.db
+.idea
+.vscode
+*.swp