Wiki pages

[Matt-17]

Should be not that hard. I would suggest the DevOps approach:
adding a {repository}.wiki which will hold several *.md-files.
Then we add an .order file as simple ordering and titling (having the original title and with strippathname down to the file).

Steps:

• we support showing root path only
• adding folder support (if a file has also a folder, it's expandable)
• drag and drop for ordering
• adding images and other files
• enable online editing as markdown
• wiki features