Add analytics and documentation updates

.env.example

@@ -0,0 +1,10 @@
+# Database
+DATABASE_URL="postgresql://user:password@host/dbname?sslmode=require"
+DIRECT_URL="postgresql://user:password@host/dbname?sslmode=require"
+
+# Auth/session
+# Generate with: openssl rand -base64 32
+SESSION_SECRET="replace-with-at-least-32-characters"
+
+# Optional; Vercel and Node set this automatically in deployed environments.
+NODE_ENV="development"