remove spotify as lyrics source

In order to stay on f-droid spotify has to be removed. Doing different flavors is not worth it in my opinion.

app/src/main/res/values/strings.xml

@@ -8,7 +8,6 @@
     <string name="timeout">Request has timed out, try again later</string>
     <string name="generic_error">An error has occurred, try again later</string>
     <string name="retry">Retry</string>
-    <string name="spotify_no_lyrics_error">Sorry, Spotify doesn\'t have lyrics for this song</string>
 
     <!--  Home  -->
     <string name="no_supported_player">No supported player is running</string>
@@ -24,7 +23,6 @@
     <string name="notification_post_permission_desc">LyricsGrabbr requires notification permissions to start a foreground service for the purpose of listening to music notifications, and cannot function without it.</string>
     <string name="notification_post_permission_not_granted">Notification permission is not granted, the app will not function properly</string>
     <string name="grant_permission">Grant Permission</string>
-    <string name="no_spotify_song_playing">No song is playing on Spotify</string>
 
     <!--  Settings  -->
     <string name="settings">Settings</string>
@@ -33,10 +31,6 @@
     <string name="theme_light">Light</string>
     <string name="theme_dark">Dark</string>
     <string name="theme_system">Use System Theme</string>
-    <string name="use_spotify_api">Use Spotify for lyrics</string>
-    <string name="spotify_client_id" translatable="false">Spotify Client ID</string>
-    <string name="not_set">Not Set</string>
-    <string name="spotify_client_id_desc">This app can use Spotify\'s Web API to get lyrics. You need to provide a Spotify Client ID to use this feature. You can get one from <annotation href="https://developer.spotify.com/dashboard/applications">here</annotation>.\n<annotation weight="bold">This only works if you\'re playing music from the Spotify player.</annotation></string>
 
     <!--  Lyrics  -->
     <string name="lyrics">Lyrics</string>