Revert "remove environment-selector"

This reverts commit f0bd8785dda6d60434dcf7d2ad03c426d333b0d4.

Author: stefan0xC

apps/web/src/app/layouts/frontend-layout.component.html

@@ -1,6 +1,8 @@
 <router-outlet></router-outlet>
 
 <footer class="tw-text-center tw-my-12">
+  <environment-selector></environment-selector>
+
   <div bitTypography="body2">Vaultwarden Web</div>
   <div bitTypography="body2">{{ version }}</div>
   <br />