feat: add PARAGON_THEME_URLS to .env files

Author: dcoa

.env

@@ -30,3 +30,5 @@ USER_INFO_COOKIE_NAME=null
 PUBLISHER_BASE_URL=''
 APP_ID=''
 MFE_CONFIG_API_URL=''
+# Fallback in local style files
+PARAGON_THEME_URLS={}

.env.development

@@ -38,3 +38,5 @@ USER_INFO_COOKIE_NAME='edx-user-info'
 PUBLISHER_BASE_URL='http://localhost:18400'
 APP_ID='support-tools'
 MFE_CONFIG_API_URL='http://localhost:18000/api/mfe_config/v1'
+# Fallback in local style files
+PARAGON_THEME_URLS={}

.env.test

@@ -21,3 +21,4 @@ SUBSIDY_BASE_URL='http://localhost:18280'
 USER_INFO_COOKIE_NAME='edx-user-info'
 APP_ID=''
 MFE_CONFIG_API_URL=''
+PARAGON_THEME_URLS={}