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/state/models/ui/shell.ts

@@ -136,10 +136,6 @@ export interface PostLanguagesSettingsModal {
   name: 'post-languages-settings'
 }
 
-export interface PreferencesHomeFeed {
-  name: 'preferences-home-feed'
-}
-
 export interface OnboardingModal {
   name: 'onboarding'
 }
@@ -156,7 +152,6 @@ export type Modal =
   | ContentFilteringSettingsModal
   | ContentLanguagesSettingsModal
   | PostLanguagesSettingsModal
-  | PreferencesHomeFeed
 
   // Moderation
   | ModerationDetailsModal