Some small admin js/css updates (#6501)

* Some small admin js/css updates

- Updated JS libraries
- Fixed some eslint errors
- Small update on the theme icon's to be a bit smaller and better sized.
  Used OXVG via OXVGUI to shrink and optimze them.

Probably Fixes #6493

Signed-off-by: BlackDex <black.dex@gmail.com>

* Adjust the size of the moon to be more inline with the other icons

Signed-off-by: BlackDex <black.dex@gmail.com>

---------

Signed-off-by: BlackDex <black.dex@gmail.com>

src/static/scripts/admin.js

@@ -1,6 +1,6 @@
 "use strict";
 /* eslint-env es2017, browser */
-/* exported BASE_URL, _post */
+/* exported BASE_URL, _post _delete */
 
 function getBaseUrl() {
     // If the base URL is `https://vaultwarden.example.com/base/path/admin/`,