refactoring into src/, removed some items
added headings to all pages
fixed removal of sql statement
using smaller heading for page subtitles
moved php src files to src/php
Revert "moved php src files to src/php"

This reverts commit 962da6805d051dd5c2055a9cc006fbed629481a5.
Revert "Revert "moved php src files to src/php""

This reverts commit 6dcc1b8cbdba5e366a224171462e5fe2b986f7c9.