Revert "All WordPress Lessons"

This reverts commit 4f485cf7cd0d59bfb9778576093cd4a41b9367c4.

Conflicts:
	Lesson/01-introduction.pptx
	Lesson/02-installation.pptx
	Lesson/03-dashboard-overview.pptx
	Lesson/04-tip.pptx
	Lesson/05-theme-development.pptx
	Lesson/06-plugin-development.pptx