fix: clean up unused dependencies and env variables (#471)

* build: cleanup environment variables

Setting 'null' to an empty string '' (which is falsy and the right thing here)

* fix: clean up unused dependencies

- Removing a number of packages from dependencies that simply were not in use.
- Removing 'font-awesome' dependency which we didn't actually need in our stylesheet - we don't use it, though we were importing it and setting a variable from it.  Not sure why it was ever there.

* fix: remove unused dependency

We get 'history' through frontend-platform.

.env

@@ -1,36 +1,23 @@
 NODE_ENV='production'
-ACCESS_TOKEN_COOKIE_NAME=null
-BASE_URL=null
-CREDENTIALS_BASE_URL=null
-CSRF_TOKEN_API_PATH=null
-ECOMMERCE_BASE_URL=null
-LANGUAGE_PREFERENCE_COOKIE_NAME=null
-LMS_BASE_URL=null
-LOGIN_URL=null
-LOGOUT_URL=null
-MARKETING_SITE_BASE_URL=null
-ORDER_HISTORY_URL=null
-REFRESH_ACCESS_TOKEN_ENDPOINT=null
-SEGMENT_KEY=null
+ACCESS_TOKEN_COOKIE_NAME=''
+BASE_URL=''
+CREDENTIALS_BASE_URL=''
+CSRF_TOKEN_API_PATH=''
+ECOMMERCE_BASE_URL=''
+LANGUAGE_PREFERENCE_COOKIE_NAME=''
+LMS_BASE_URL=''
+LOGIN_URL=''
+LOGOUT_URL=''
+MARKETING_SITE_BASE_URL=''
+ORDER_HISTORY_URL=''
+REFRESH_ACCESS_TOKEN_ENDPOINT=''
+SEGMENT_KEY=''
 SITE_NAME=''
-USER_INFO_COOKIE_NAME=null
-APPLE_APP_STORE_URL=null
-CONTACT_URL=null
-ENTERPRISE_LEARNER_PORTAL_HOSTNAME=null
-ENTERPRISE_MARKETING_FOOTER_UTM_MEDIUM=null
-ENTERPRISE_MARKETING_URL=null
-ENTERPRISE_MARKETING_UTM_CAMPAIGN=null
-ENTERPRISE_MARKETING_UTM_SOURCE=null
-FACEBOOK_URL=null
-GOOGLE_PLAY_URL=null
-LINKED_IN_URL=null
-OPEN_SOURCE_URL=null
-PRIVACY_POLICY_URL=null
-REDDIT_URL=null
-SUPPORT_URL=null
-TERMS_OF_SERVICE_URL=null
-TWITTER_URL=null
-YOU_TUBE_URL=null
+USER_INFO_COOKIE_NAME=''
+CONTACT_URL=''
+ENTERPRISE_LEARNER_PORTAL_HOSTNAME=''
+SUPPORT_URL=''
+TERMS_OF_SERVICE_URL=''
 LOGO_URL=''
 LOGO_TRADEMARK_URL=''
 LOGO_WHITE_URL=''

.env.development

@@ -12,26 +12,13 @@ LOGOUT_URL='http://localhost:18000/logout'
 MARKETING_SITE_BASE_URL='http://localhost:18000'
 ORDER_HISTORY_URL='localhost:1996/orders'
 REFRESH_ACCESS_TOKEN_ENDPOINT='http://localhost:18000/login_refresh'
-SEGMENT_KEY=null
+SEGMENT_KEY=''
 SITE_NAME=localhost
 USER_INFO_COOKIE_NAME='edx-user-info'
-APPLE_APP_STORE_URL='https://www.apple.com/ios/app-store/'
 CONTACT_URL='http://localhost:18000/contact'
 ENTERPRISE_LEARNER_PORTAL_HOSTNAME='http://localhost:8080'
-ENTERPRISE_MARKETING_FOOTER_UTM_MEDIUM='Footer'
-ENTERPRISE_MARKETING_URL='http://example.com'
-ENTERPRISE_MARKETING_UTM_CAMPAIGN='my_campaign'
-ENTERPRISE_MARKETING_UTM_SOURCE='edX profile'
-FACEBOOK_URL='https://www.facebook.com'
-GOOGLE_PLAY_URL='https://play.google.com/store'
-LINKED_IN_URL='https://www.linkedin.com'
-OPEN_SOURCE_URL='http://localhost:18000/openedx'
-PRIVACY_POLICY_URL='http://localhost:18000/privacy-policy'
-REDDIT_URL='https://www.reddit.com'
 SUPPORT_URL='http://localhost:18000/support'
 TERMS_OF_SERVICE_URL='http://localhost:18000/terms-of-service'
-TWITTER_URL='https://twitter.com'
-YOU_TUBE_URL='https://www.youtube.com'
 LOGO_URL=https://edx-cdn.org/v3/default/logo.svg
 LOGO_TRADEMARK_URL=https://edx-cdn.org/v3/default/logo-trademark.svg
 LOGO_WHITE_URL=https://edx-cdn.org/v3/default/logo-white.svg