Some Backend Admin fixes and updates (#5272)

* Some Backend Admin fixes and updates

- Updated datatables
- Added a `X-Robots-Tags` header to prevent indexing
- Modified some layout settings
- Added Websocket check to diagnostics
- Added Security Header checks to diagnostics
- Added Error page response checks to diagnostics
- Modifed support string layout a bit

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

* Some small fixes

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

---------

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

src/util.rs

@@ -51,9 +51,11 @@ impl Fairing for AppHeaders {
             }
         }
 
+        // NOTE: When modifying or adding security headers be sure to also update the diagnostic checks in `src/static/scripts/admin_diagnostics.js` in `checkSecurityHeaders`
         res.set_raw_header("Permissions-Policy", "accelerometer=(), ambient-light-sensor=(), autoplay=(), battery=(), camera=(), display-capture=(), document-domain=(), encrypted-media=(), execution-while-not-rendered=(), execution-while-out-of-viewport=(), fullscreen=(), geolocation=(), gyroscope=(), keyboard-map=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), screen-wake-lock=(), sync-xhr=(), usb=(), web-share=(), xr-spatial-tracking=()");
         res.set_raw_header("Referrer-Policy", "same-origin");
         res.set_raw_header("X-Content-Type-Options", "nosniff");
+        res.set_raw_header("X-Robots-Tag", "noindex, nofollow");
         // Obsolete in modern browsers, unsafe (XS-Leak), and largely replaced by CSP
         res.set_raw_header("X-XSS-Protection", "0");