Only preload JS in /web pages (#5325)

app/views/home/index.html.haml

 - content_for :header_tags do
+  %link{ href: asset_pack_path('features/getting_started.js'), crossorigin: 'anonymous', rel: 'preload', as: 'script' }/
+  %link{ href: asset_pack_path('features/compose.js'), crossorigin: 'anonymous', rel: 'preload', as: 'script' }/
+  %link{ href: asset_pack_path('features/home_timeline.js'), crossorigin: 'anonymous', rel: 'preload', as: 'script' }/
+  %link{ href: asset_pack_path('features/notifications.js'), crossorigin: 'anonymous', rel: 'preload', as: 'script' }/
+  %link{ href: asset_pack_path('features/community_timeline.js'), crossorigin: 'anonymous', rel: 'preload', as: 'script' }/
+  %link{ href: asset_pack_path('features/public_timeline.js'), crossorigin: 'anonymous', rel: 'preload', as: 'script' }/
   %meta{name: 'applicationServerKey', content: Rails.configuration.x.vapid_public_key}
   %script#initial-state{ type: 'application/json' }!= json_escape(@initial_state_json)
 

app/views/layouts/application.html.haml

@@ -21,14 +21,6 @@
     = stylesheet_pack_tag 'common', media: 'all'
     = stylesheet_pack_tag current_theme, media: 'all'
     = javascript_pack_tag 'common', integrity: true, crossorigin: 'anonymous'
-
-    %link{ href: asset_pack_path('features/getting_started.js'), crossorigin: 'anonymous', rel: 'preload', as: 'script' }/
-    %link{ href: asset_pack_path('features/compose.js'), crossorigin: 'anonymous', rel: 'preload', as: 'script' }/
-    %link{ href: asset_pack_path('features/home_timeline.js'), crossorigin: 'anonymous', rel: 'preload', as: 'script' }/
-    %link{ href: asset_pack_path('features/notifications.js'), crossorigin: 'anonymous', rel: 'preload', as: 'script' }/
-    %link{ href: asset_pack_path('features/community_timeline.js'), crossorigin: 'anonymous', rel: 'preload', as: 'script' }/
-    %link{ href: asset_pack_path('features/public_timeline.js'), crossorigin: 'anonymous', rel: 'preload', as: 'script' }/
-
     = javascript_pack_tag "locale_#{I18n.locale}", integrity: true, crossorigin: 'anonymous'
     = csrf_meta_tags