Revert "TASK: add composer configuration"

This reverts commit 3f806979dc2b6e1496a29ca115c1f1e9ca413099.
Revert "TASK: add .gitignore file"

This reverts commit 5b654083a70942566d041af2e429c0a13dbb539d.
Revert "TASK: remove xhprof-ui from repository; will be installed as composer package"

This reverts commit ee02c8fb08870ce4c1ce0a95fc2d43013138571a.