Add precommit hooks

[dinhtungdu]

trafficstars

Is your enhancement related to a problem? Please describe.

We don't run any linter before committing for now. This may lead to inconsistent coding styling and syntax errors get committed.

Describe the solution you'd like

Add precommit hooks and linters to this project.

Designs

Use husky and lint-staged for precommit hooks. Use eslint for JS and phpcs for PHP files.

Describe alternatives you've considered

n/a

Additional context

n/a