Fixes these `npm install` warnings:
> deprecated [email protected]: babel-eslint is now @babel/eslint-parser. This package will no longer receive updates.
> deprecated [email protected]: This loader has been deprecated. Please use eslint-webpack-plugin
Cherry-picked from starter-kit commit 0e608d562a
npm 7 changed how it resolves dependencies, and cockpit-machines fails
to build with lots of unresolved peer dependencies of PatternFly.
With an absolute path, `resolve.modules` will only look in that
directory; the default is a relative path "node_modules" that just
works [1]. We need to keep the `$SRCDIR` support, but convert the path
to a relative one to keep the old recursive search behaviour.
This magically fixes the label alignment in dialogs, update the pixel
test references accordingly.
[1] https://webpack.js.org/configuration/resolve/#resolvemodules
See also a117600dff
* Removed unused css files
* Converted all UI elements to patternfly 4
* Implemented config page under same app
* Replaced slider with patternfly `Progress` component
eslint is much more powerful and flexible than jshint, and we don't want
to promote writing new projects with pre-ES6 code.
As a side effect, this also avoids downloading PhantomJS (see
https://github.com/jshint/jshint/issues/3318), thereby cutting down
node_modules/ from 470 MB to 210 MB.
