refactor services to be private and build configuration at build time

Author: IonBazan

.env

@@ -19,7 +19,8 @@ APP_SECRET=5dd8ffca252d95e8b4fb5b2d15310e92
 #TRUSTED_HOSTS='^(localhost|example\.com)$'
 ###< symfony/framework-bundle ###
 
-SYMFONY_DOCS_SECRET=XX
+SYMFONY_DOCS_SECRET=''
+SYMFONY_SECRET=''
 
 ###> knplabs/github-api ###
 GITHUB_TOKEN=XXX

.env.test

@@ -3,3 +3,5 @@ KERNEL_CLASS='App\Kernel'
 APP_SECRET='$ecretf0rt3st'
 SYMFONY_DEPRECATIONS_HELPER=999999
 PANTHER_APP_ENV=panther
+SYMFONY_DOCS_SECRET=''
+SYMFONY_SECRET=''