friendly markup names for UI: e.g. 'Markdown' not 'mdwn' (patch)

[ikiwiki] / doc / todo / html.mdwn

Create some nice(r) stylesheets.

Should be doable w/o touching a single line of code, just
editing the [[wikitemplates]] and/or editing [[style.css]].

[[done]] ([[css_market]] ..)