* Fixed missing cross_origin() tags on various functions
* Added popper javascript library for tooltips
* Added material design icons font and css locally
The database will need to be rebuilt, because of a previous mistake of code completion setting a field to boolean instead of int.
Added flaskmigrate as dependency
New Javascript function for replies, to be able to switch a reply on and off during commenting
To use replies, one will need to add another hugo range block, see docs for details
