Add dist dir to gitignore

[Lewuathe]

npm run build creates a build directory in dist. We can add this dir to gitignore.

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This change is 

[nsthorat]

Review status: 0 of 1 files reviewed at latest revision, 1 unresolved discussion, some commit checks failed.

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.gitignore, line 10 at r1 (raw file):

npm-debug.log
.DS_Store
dist

can you make this dist/ just so that it mirrors the style from above (and it's clear it's a dir)

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Comments from Reviewable

[Lewuathe]

@nsthorat Thanks for checking. I updated accordingly.

[nsthorat]

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Reviewed 1 of 1 files at r2.
Review status: all files reviewed at latest revision, 1 unresolved discussion, some commit checks failed.

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Comments from Reviewable

[nsthorat]

Update this branch and then I will merge it (someone added something else to gitignore)!