Extract SPA-handled routes to stand-alone file (#33190)

config/routes/web_app.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+# Paths handled by the React application, which do not:
+# - Require indexing
+# - Have alternative format representations
+
+%w(
+  /blocks
+  /bookmarks
+  /conversations
+  /deck/(*any)
+  /directory
+  /domain_blocks
+  /explore/(*any)
+  /favourites
+  /follow_requests
+  /followed_tags
+  /getting-started
+  /home
+  /keyboard-shortcuts
+  /links/(*any)
+  /lists/(*any)
+  /mutes
+  /notifications_v2/(*any)
+  /notifications/(*any)
+  /pinned
+  /public
+  /public/local
+  /public/remote
+  /publish
+  /search
+  /start/(*any)
+  /statuses/(*any)
+).each { |path| get path, to: 'home#index' }