feat: divide most navigation.scss styles into components

- navigation.vue and topNavigation.vue
- contentAuth.vue

src/components/home/contentAuth.vue

@@ -171,6 +171,24 @@ export default {
   }
 }
 
+.mobile-overlay {
+	display: none;
+	position: fixed;
+	top: 0;
+	bottom: 0;
+	left: 0;
+	right: 0;
+	background: rgba(250, 250, 250, 0.8);
+	z-index: 5;
+	opacity: 0;
+	transition: all $transition;
+
+	@media screen and (max-width: $tablet) {
+		display: block;
+		opacity: 1;
+	}
+}
+
 .keyboard-shortcuts-button {
 	position: fixed;
 	bottom: calc(1rem - 4px);