Docs: Add USE_LOCAL variable

Author: andrew-opensignlabs

.env.example

@@ -39,6 +39,9 @@ DO_ACCESS_KEY_ID=
 DO_SECRET_ACCESS_KEY=
 # Digital ocean spaces region or AWS s3 region
 DO_REGION=us-west
+# Set this to true id you are using local storage instead of s3 compatible storage
+# USE_LOCAL=TRUE
+
 
 # Email mailgun config (The app will not initialize if any of these 3 variables are not set) *********************************************************************************************************************
 MAILGUN_API_KEY=