#20 Adopt markdown

[nenopera]

This seems to be a aged tool, offering solutions when there was no clear option, but is time to accept the community choices. No one wants to learn another markup language. Wikidpad and markdown are just a choice, but for whatever reason markdown have win.

At least offer an option to choose the markup language. I give up with wikidpad just for these, and will come back if markdown (or multimarkdown) is adopted, everything else is good enough to choose this tool as a desktop wiki