Setup docs to build using Sphinx
Lowercase headings in man pages for html output
Restrict header info of man pages to html only

Sphinx autogenerates this header information when building man pages,
but not html.
Show URLs of external links in man pages
Add content to main documentation page
Add Getting Started guide to documentation
Explain list of manual pages
Add copyright notice to KDE script drawer guide
Fix line endings in additional-keys.rst
Explain why additional-keys.rst is useful
Make link to project website in docs more obvious
Add man as phony target to doc makefile
Fix copyright year in documentation
Add conf.py as a dependency for man pages
Update build dependencies
Fix for building docs in parallel

Before, `$(SPHINXBUILD) -b man ...` was getting called multiple times
when building - once for each man page - so when run in parallel, this
generated errors. Now, there is a single phony target for building man
pages that should only be called once.
Remove unnecessary output when building
Indent with spaces
Merge branch 'sphinx'
Changelog entry