improve lint setting on frontend

[sanposhiho]

Hello team. This PR improves linters setting for the frontend. (and apply it.)

• web/.eslintrc.js
• web/package.json

Sorry for the huge diff, but almost all changes are from linters and no change in appearance of frontend.

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/lifecycle stale

[sanposhiho]

/remove-lifecycle stale

[sanposhiho]

/label tide/merge-method-squash

[haosdent]

/lgtm

[sanposhiho]

Let me approve this PR.

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sanposhiho

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