fix #31 Updating source files

This commit replaces all the harcoded url we have inside the source files with a predefined pattern that will be replaced automatically with the proper url (prod or localhost).
Merge branch 'updating_md_files_for_placeholder' of https://github.com/fab-b/usermanual into fab-b-updating_md_files_for_placeholder

Conflicts:
	src/latest/templates/advanced/dom_events.md