feat: support design tokens and paragon 23 (#1588)

Author: dcoa

.env

@@ -50,3 +50,5 @@ TWITTER_URL=''
 USER_INFO_COOKIE_NAME=''
 OPTIMIZELY_FULL_STACK_SDK_KEY=''
 SHOW_UNGRADED_ASSIGNMENT_PROGRESS=''
+# Fallback in local style files
+PARAGON_THEME_URLS={}

.env.development

@@ -52,3 +52,5 @@ CHAT_RESPONSE_URL='http://localhost:18000/api/learning_assistant/v1/course_id'
 PRIVACY_POLICY_URL='http://localhost:18000/privacy'
 OPTIMIZELY_FULL_STACK_SDK_KEY=''
 SHOW_UNGRADED_ASSIGNMENT_PROGRESS=''
+# Fallback in local style files
+PARAGON_THEME_URLS={}