feat!: add design tokens support (#1737)

BREAKING CHANGE: Pre-design-tokens theming is no longer supported.

Co-authored-by: Diana Olarte <[email protected]>

Author: brian-smith-tcril

.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={}