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>

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

src/static/scripts/admin_users.js

@@ -1,6 +1,6 @@
 "use strict";
 /* eslint-env es2017, browser, jquery */
-/* global _post:readable, BASE_URL:readable, reload:readable, jdenticon:readable */
+/* global _post:readable, _delete:readable BASE_URL:readable, reload:readable, jdenticon:readable */
 
 function deleteUser(event) {
     event.preventDefault();