I hope this question is not deemed off-topic, but I cannot think of a more appropriate place to ask it (few tech sites care about support for MathJax and $\LaTeX$), and I think that blogging about mathematical topics is certainly part of mathematical education viewed in the broad sense.
Anyway, I currently have an almost-dormant blog on wordpress.com, and I would like to reinvigorate it and post more frequently. However I have realised that Wordpress itself is hampering me, largely because of its primitive support for $\LaTeX$; every expression has to be between non-standard delimiters and is then replaced by an image which is usually the wrong size and aligned incorrectly. So this results in tediously writing not-very-reusable source-text that is rendered into ugly output - basically a lose-lose-lose situation.
Anyway, I had better finish with an actual question:
What is the best way to write mathematical content, preferably using Markdown for formatting, and have the resulting content appear online, with the mathematics rendered in MathJax?