Update `make screenshots` to run the new screenshotter
Update `make screenshots` to run the new screenshotter

Test Plan:
- run `make screenshots` and verify that the screenshotter runs

Auditors: alpert

zhanghuiguoanlige/KaTeX,Khan/KaTeX,Khan/KaTeX,twitwi/KaTeX,zhanghuiguoanlige/KaTeX,azotova/KaTeX,kevinbarabash/KaTeX,kwangkim/KaTeX,spicyj/KaTeX,xymostech/KaTeX,saschatimme/KaTeX,kevinbarabash/KaTeX,kwangkim/KaTeX,kevinbarabash/KaTeX,kwangkim/katex-npm-0.7.0-pre,azotova/KaTeX,kwangkim/KaTeX,kwangkim/KaTeX,kwangkim/katex-npm-0.7.0-pre,xymostech/KaTeX,azotova/KaTeX,gagern/KaTeX,zhanghuiguoanlige/KaTeX,JetStarBlues/KaTeX,crepererum/KaTeX,twitwi/KaTeX,xymostech/KaTeX,zhanghuiguoanlige/KaTeX,kevinbarabash/KaTeX,mcanthony/KaTeX,saschatimme/KaTeX,kevinbarabash/KaTeX,spicyj/KaTeX,frankandrobot/KaTeX,crepererum/KaTeX,xymostech/KaTeX,twitwi/KaTeX,xymostech/KaTeX,mcanthony/KaTeX,frankandrobot/KaTeX,JetStarBlues/KaTeX,saschatimme/KaTeX,azotova/KaTeX,spicyj/KaTeX,azotova/KaTeX,frankandrobot/KaTeX,kwangkim/KaTeX,kwangkim/katex-npm-0.7.0-pre,gagern/KaTeX,JetStarBlues/KaTeX,Khan/KaTeX,JetStarBlues/KaTeX,gagern/KaTeX,twitwi/KaTeX,kwangkim/katex-npm-0.7.0-pre,frankandrobot/KaTeX,spicyj/KaTeX,gagern/KaTeX,twitwi/KaTeX,crepererum/KaTeX,frankandrobot/KaTeX,JetStarBlues/KaTeX,mcanthony/KaTeX,zhanghuiguoanlige/KaTeX,crepererum/KaTeX,gagern/KaTeX,kwangkim/katex-npm-0.7.0-pre,mcanthony/KaTeX,saschatimme/KaTeX,saschatimme/KaTeX,crepererum/KaTeX,mcanthony/KaTeX,spicyj/KaTeX