feat!: add design tokens support (#1737) (#10)

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

Co-authored-by: Brian Smith <112954497+brian-smith-tcril@users.noreply.github.com>
Co-authored-by: Diana Olarte <diana.olarte@edunext.co>

.env.development

@@ -54,3 +54,5 @@ PRIVACY_POLICY_URL='http://localhost:18000/privacy'
 OPTIMIZELY_FULL_STACK_SDK_KEY=''
 SHOW_UNGRADED_ASSIGNMENT_PROGRESS=''
 FEATURE_ENABLE_CHAT_V2_ENDPOINT='false'
+# Fallback in local style files
+PARAGON_THEME_URLS={}