Prevent duplicate form and navbar listeners after page transitions, tidy env, env example

.env.example

@@ -0,0 +1,7 @@
+# Copy to `.env` and fill in real values. Never commit `.env`.
+EMAIL_HOST=smtp.example.com
+EMAIL_PORT=587
+EMAIL_SECURE=false
+EMAIL_USER=user@example.com
+EMAIL_PASS=change-me
+EMAIL_FROM=noreply@example.com