Merge Tutorials and How-to Guides

We do not need separate top-level sections for Basic Tutorials and How-to Guides (esp. clear since most of the Basic Tutorials subsections are titled "How to....".
We should merge all of the content for these two sections under How-to Guides with "How to Add a New License" and "How to Add New License Rules after.." after "How to set what will be detected..".
"Add a Post-Scan Plugin" will be the last entry in How-to Guides.
We should also remove "How to " from the subsection titles since that will be covered by the Section title.
In the future we may want to separate the more technical How to sections like Add a License or Add a Post-Scan Plugin from the rest, but that is not necessary with the current amount of How-to content