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/resources/static/images/update.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M21,10.12H14.22L16.96,7.3C14.23,4.6 9.81,4.5 7.08,7.2C4.35,9.91 4.35,14.28 7.08,17C9.81,19.7 14.23,19.7 16.96,17C18.32,15.65 19,14.08 19,12.1H21C21,14.08 20.12,16.65 18.36,18.39C14.85,21.87 9.15,21.87 5.64,18.39C2.14,14.92 2.11,9.28 5.62,5.81C9.13,2.34 14.76,2.34 18.27,5.81L21,3V10.12M12.5,8V12.25L16,14.33L15.28,15.54L11,13V8H12.5Z" /></svg>