Reinstate combining duplicate tutorial files into the Setting Up Maven tutorial, as previously done in
https://github.com/jhinkey/liferay-docs/commit/15ed472da0f07098c80369bdc39d8af627c72f41
Add header IDs to <h1> headers in Maven tutorials. Removed unneeded IDs from h2, h3, etc, level headers
Maven tutorials - Update links and next steps.