feat: Component toggleability and add toggleable components to quick settings menu (#707)

* feat: toggleable extensions

* fix: return all themes for quick settings

* chore: bump snjs deps

* feat: Use Switch component for toggle in Quick Settings Menu

* feat: Add toggleableComponents to footer_view

* refactor: Change "components" to "toggleableComponents"

* feat: Add checked state to component toggle in quick settings menu

app/assets/javascripts/preferences/components/Content.tsx

@@ -8,6 +8,10 @@ export const Subtitle: FunctionComponent<{ className?: string }> = ({ children,
   <h4 className={`font-medium text-sm m-0 mb-1 ${className}`}>{children}</h4>
 );
 
+export const SubtitleLight: FunctionComponent<{ className?: string }> = ({ children, className = "" }) => (
+  <h4 className={`font-normal text-sm m-0 mb-1 ${className}`}>{children}</h4>
+);
+
 export const Text: FunctionComponent<{ className?: string }> = ({
   children,
   className = '',