Refactored Social auth into service, Made entity an abstract class

.env.example

@@ -1,19 +1,31 @@
-APP_ENV=local
-APP_DEBUG=true
+# Environment
+APP_ENV=production
+APP_DEBUG=false
 APP_KEY=SomeRandomString
 
+# Database details
 DB_HOST=localhost
-DB_DATABASE=homestead
-DB_USERNAME=homestead
-DB_PASSWORD=secret
+DB_DATABASE=database_database
+DB_USERNAME=database_username
+DB_PASSWORD=database__user_password
 
+# Cache and session
 CACHE_DRIVER=file
 SESSION_DRIVER=file
 QUEUE_DRIVER=sync
 
+# Social Authentication
+GITHUB_APP_ID=false
+GITHUB_APP_SECRET=false
+GOOGLE_APP_ID=false
+GOOGLE_APP_SECRET=false
+# URL for social login redirects, NO TRAILING SLASH
+APP_URL=http://bookstack.dev
+
+# Mail settings
 MAIL_DRIVER=smtp
-MAIL_HOST=mailtrap.io
-MAIL_PORT=2525
+MAIL_HOST=localhost
+MAIL_PORT=1025
 MAIL_USERNAME=null
 MAIL_PASSWORD=null
 MAIL_ENCRYPTION=null