* Run screenshotter using Chrome 83 and Firefox 76
* Update screenshots
* Update NegativeSpace-chrome screenshot
The new screenshot is correct as per #1194.
* Update Units-chrome screenshot
The new screenshot is correct as per #732 and compared to Firefox.
* Update screenshots
* Re-enable \includegraphics now that we have trust setting
This reverts commit 5806b240b3.
* Include Khan Academy test logo in repo and use in test (fix#1892)
* Update screenshots
* Update documentation
* Add tests, cleanup existing tests
* Update snapshots
* Enable trust testing (trust=true by default)