GitHub Logo on theme background change

the contrast is improved while the theme is switched.
Handled the case if there is no storage value for the selected class.

pages/settings.vue

@@ -102,6 +102,13 @@
       applyTheme(name) {
         this.applySetting('THEME_CLASS', name);
         document.documentElement.className = name;
+		let imgGitHub = document.getElementById("imgGitHub");
+		imgGitHub.style['filter'] = "";
+		imgGitHub.style['webkit-filter'] = "invert(100%)";
+		if (name.includes("light")){
+			imgGitHub.style['filter'] = "invert(100%)";
+			imgGitHub.style['webkit-filter'] = "invert(100%)";
+		}
       },
       setActiveColor(color, vibrant) {
         // By default, the color is vibrant.