Rollup merge of #56523 - JohnHeitmann:es6, r=GuillaumeGomez

Added a bare-bones eslint config (removing jslint)

This change removes the small bit of jslint config, replacing it
with eslint. I've currently configured eslint to mostly only report
the more serious of lints, although there are still some style nits
turned on.

Eslint better supports modern js, and will be a good pre-TypeScript code
quality aid.

Install eslint with `npm install -g eslint`. Run with `eslint html/static/*.js`,
or let your IDE do it. This requires no build step.

Upcoming changes will start fixing identified bugs and other lints (mostly unused and var redef issues).

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