Move PreferencesHomeFeed to a screen instead of a modal (#1335)

* move `PreferencesHomeFeed` to a screen instead of a modal

* add web route for home feed preferences

* upgrade `@miblanchard/react-native-slider` to fix lint

* fix web route naming

* fix desktop web styling

* add `react-native-slider` mock

src/routes.ts

@@ -23,6 +23,7 @@ export const router = new Router({
   Debug: '/sys/debug',
   Log: '/sys/log',
   AppPasswords: '/settings/app-passwords',
+  PreferencesHomeFeed: '/settings/home-feed',
   SavedFeeds: '/settings/saved-feeds',
   Support: '/support',
   PrivacyPolicy: '/support/privacy',