reverted to vim-markdown
reverted to vim-markdown

Pandoc is good if actually doing pandoc stuff in vim, but is actually
buggier and not as good highlighting for our plain .md files.

People who want to edit our wiki pages within vim, can use Pandoc, but
we won't get into that here.

akegalj/snowdrift,akegalj/snowdrift,snowdriftcoop/snowdrift