Switched to GFM Markdown flavour to allow rendering checkboxes

[reactorcoremeltdown]

Summary

In GFM one can use [ ] and [x] in lists to draw checkboxes. That helps to track progress in some documents (not intending to use Wikmd as a task tracker, but that may be useful to display status of things, and it's much quicker to type than strikethrough)

Details

Adding this feature involved two things:

• Changing markup to gfm in Pandoc
• Excluding form elements from html Cleaner

Please feel free to reject the PR if any of my changes violate the design.

Checks

• In case of new feature, add short overview in docs/<corresponding file>
• Tested changes

[Linbreux]

hi @reactorcoremeltdown
That maybe a nice feature, everything seems to work, except that the latex output is not correct anymore...

[reactorcoremeltdown]

hi @reactorcoremeltdown That maybe a nice feature, everything seems to work, except that the latex output is not correct anymore...

May I ask you for source LaTeX expression, so I could test the feature thoroughly?

[Linbreux]

You can find it in the "how to use the wiki" file. It should be in your wikmd repo :)

[reactorcoremeltdown]

Does that look better? (Seems like not filtering out form elements is enough for rendering checkboxes)

[reactorcoremeltdown]

@Linbreux requesting a review here.

Please let me know if something looks odd!

[Linbreux]

It would be nice to have. Although I don't get any checkbox...