feat(web-player): filter the explore results with a chip group

Under the search box there are now three checkbox chips choosing what the page
shows. Songs keep the existing grid and Albums searches the albums by title;
Users is rendered disabled until there is something behind it.

web-player/src/lib/config.ts

@@ -6,5 +6,6 @@ export const ALBUMS_PAGE_SIZE = 50;
 export const ALBUM_TRACKS_PAGE_SIZE = 200;
 export const ALBUM_EARLIEST_YEAR = 1877;
 export const LIBRARY_PICKER_PAGE_SIZE = 50;
+export const EXPLORE_ALBUMS_PAGE_SIZE = 18;
 export const HOME_LATEST_PAGE_SIZE = 12;
 export const YOUTUBE_FILLER_LIMIT = 27;