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* Added demo links.
* Fixed options handling. Options from command line now will actually work if a cfg file is used.
* Corrected relative paths handling:
- paths in sources are now relative to the cfg file (previously they were relative to whatever was cwd).
- relative option now correctly works when destination file is not in cwd.
* Fixed layout of slides with many headering (no more paddings for headings, all root elements are spread out evenly
anyway).
* Fixed bad styling of ToC (and probably other things in the sidebar).
* Fixed ToC links (contributed by Cyrille Pontvieux).