Performance: converting markdown to html on retrieval
Performance: converting markdown to html on retrieval

It seems like md->html was a bit expensive when running it on a few
hundred items. It wasn't a dealbreaker, but it bugged me enough to
profile and fix it.

This wasn't an issue before endless scrolling since we always rendered
a limited set of items the moment we queried them.

ricardojmendez/memento,ricardojmendez/memento,ricardojmendez/memento