LaTeX support

Hey friends!

Announcing our first feature since we launched: LaTeX support!

To use this feature, you just need to put your equations between two sets of $$ like this:

$$\frac{10}{20}$$

It will then be rendered once the cursor leave the item.

We spent a few weeks working and testing this feature. So far, the hardest challenge is to find the right timing to show or hide the rendered LaTeX. A great shout out to Shida for figuring out a way to cleanly swap between the plain text version and the rendered LaTeX.

Finally , we must thank the folks at Khan Academy for building the awesome KaTeX, which is powering our LaTeX rendering. It is licensed under the MIT License. A list of supported LaTeX commands can be found at https://github.com/Khan/KaTeX/wiki/Function-Support-in-KaTeX

Cheers!