Edit ESlint configuration

[riazaia]

This PR:

• adds an ignore file (with the contents of .gitignore) (that I'm almost 100% certain is unnecesary but there's so many warning in the console that it's hard to tell)
• adds a lint script in package.json
• removes the old rules we had setup
• adds rules that seemed reasonable to me
• overrides said rules to turn off no-non-null-assertion rule in the tests and stories folders (can't remember why...)

(No inline comments is probably excesive but I always miss those so I figured I'd throw it in)

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