remove index.html from administrator except components
remove index.html from administrator/components/com_[a-m]
Merge pull request #5377 from okonomiyaki3000/kill-indexes-admin-ex-components

remove index.html from administrator except components
Merge pull request #5378 from okonomiyaki3000/kill-indexes-admin-components

remove index.html from administrator/components/com_[a-m]