Cleanup unused elements and their dependencies

See merge request !228

Update README.md for stable branch

See merge request !227

Move docker-stable stage to trigger only when the stable branch is pushed to

See merge request !226

Update dependency shelljs to v0.8.5

See merge request !225

Update dependency portfinder to v1.0.29

See merge request !224

Update dependency css-loader to v1.0.1

See merge request !217

Remove git://github.com redirect from CI pipeline

See merge request !223

Update svgo to 2.8.0

See merge request !221

Remove unused MarkdownEditor compoment

See merge request !222

Which makes tui-editor unused, also removing dependency using `git://github.com`

Update dependency chalk to v2.4.2

See merge request !213

Update dependency optimize-css-assets-webpack-plugin to v5.0.8

See merge request !220

Update dependency js-cookie to v2.2.1

See merge request !219

Pin dependencies

See merge request !212

node-gyp was a fucking mistake

CI: Add python in test stage

See merge request !218

Remove unused dependencies

See merge request !215

Dep cleanup

See merge request !214