stylelint: 13 -> 14
postcss-preset-env: 6 -> 7
eslint-plugin-compat: 3 -> 4
replaced stylelint-config-standard with
stylelint-config-standard-scss
switched to @ronilaukkarinen/gulp-stylelint, a fork of gulp-stylelint,
due to the upstream's maintainer going missing
temporarily disabled some stylelint rules to ease transition
Replaced all Array.concat() with spread operator and/or push().
Fixed some faulty search logics when using exclusion filters.
Fixed capitalization of mac font in _variables.scss. Stylelint somehow
fricked up again in my previous commit.
Added new dev dependencies:
bulma, gulp-sass, node-sass
Updated some dependencies
Various other things related to styling
Bumped v1 version string and rebuilt client assets
