Adds update checker with user preference

Introduces an update checker feature that respects the user's preference, allowing them to enable or disable automatic update checks.

The setting is persisted in the config file and synced to the backend.

Also introduces a page dedicated to listing music that inspired the project, and makes some minor UI improvements

config.ini

@@ -1,9 +1,9 @@
 [EMLy]
-SDK_DECODER_SEMVER="1.3.2"
-SDK_DECODER_RELEASE_CHANNEL="beta"
-GUI_SEMVER="1.4.0"
-GUI_RELEASE_CHANNEL="stable"
-LANGUAGE="it"
-UPDATE_CHECK_ENABLED="true"
-UPDATE_PATH=""
-UPDATE_AUTO_CHECK="true"
+SDK_DECODER_SEMVER          = 1.3.2
+SDK_DECODER_RELEASE_CHANNEL = beta
+GUI_SEMVER                  = 1.4.0
+GUI_RELEASE_CHANNEL         = stable
+LANGUAGE                    = it
+UPDATE_CHECK_ENABLED        = false
+UPDATE_PATH                 = 
+UPDATE_AUTO_CHECK           = true