UI: settings show/hide update display (#1072)

* UI: settings show/hide update display

This PR replaces the PR #1003

In this PR, the visual for available update is added to the foreground.

There are new settings to generally show/hide the update display, and only administrators receive the update display.

* change to `Bean`

* Update AppUpdateShowService.java

* add update message

* revision service

* change shouldShow

* Update githubVersion.js

* rm folder

* Update AppUpdateService.java

src/main/java/stirling/software/SPDF/controller/web/OtherWebController.java

@@ -17,6 +17,7 @@ import io.swagger.v3.oas.annotations.tags.Tag;
 @Controller
 @Tag(name = "Misc", description = "Miscellaneous APIs")
 public class OtherWebController {
+
     @GetMapping("/compress-pdf")
     @Hidden
     public String compressPdfForm(Model model) {