Fix docs typo: `post_install` script references
Fix docs: `setup' script is optional, not mandatory
Document Cartridge Installation Process
php migration hotfix
Merge pull request #5556 from VojtechVitek/php_migration_hotfix

Merged by openshift-bot
Merge pull request #5536 from VojtechVitek/docs_setup_install_order

Merged by openshift-bot