#5 Generate overview docs

[Aslak Hellesřy]

There should be generated HTML docs (TOC) which link
to:

-The generated tag/subtask docs (from @tags)
-The generates (from xtags.xml)
-The generated taghandler docs (from @tags)

[Aslak Hellesřy]

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Correction:
-The generated task/subtask docs (from @tags)
-The generated tag docs (from xtags.xml)
-The generated taghandler docs (from @tags)