enhance(parser): Add LaTeX support

[neotyk]

closes #575

[CLAassistant]

All committers have signed the CLA.

[tangjeff0]

Recommend linting/styling/testing locally. It's faster than waiting for CI. https://github.com/athensresearch/athens/blob/master/CONTRIBUTING.md#running-ci-scripts-locally

[neotyk]

Can't seem to satisfy lint and style checks at the same time.

[tangjeff0]

Ah, yeah, that happens sometimes when importing npm packages, which use quotes. Guessing kondo and cljstyle look at the quotes differently.

Something like this might fix it: https://github.com/athensresearch/athens/blob/master/src/cljs/athens/views/graph_page.cljs#L1

Otherwise, I can take a look at this tomorrow. Functionality more important than linting.

[neotyk]

I've unnecessarily upgraded cljstyle. Let me know I can revert it.