Issue 5109 - Create stylelintrc for websites and ui modules

stylelint-config-eyeo/README.md

 # stylelint-config-eyeo
 
-A [Stylelint](https://stylelint.io) configuration that checks for compliance 
-with the [Adblock Plus coding style guide](https://adblockplus.org/coding-style#html-css) 
+A [Stylelint](https://stylelint.io) configuration that checks for compliance
+with the [Adblock Plus coding style guide](https://adblockplus.org/coding-style#html-css)
 which is used for all eyeo projects.
 
 ## Installation
 
     npm install -g stylelint
 
 This command requires administrator privileges so you might need to use `sudo`.
 
 Next, either install stylelint-config-eyeo within your project. For example:
 
     npm install --save-dev stylelint-config-eyeo
 
 Or, install stylelint-config-eyeo globally. For example:
 
     npm install -g stylelint-config-eyeo
 
 ## Usage
 
-To lint a CSS (or CSS-like, e.g. SCSS, SugarCSS, Less) file using Stylelint 
+To lint a CSS (or CSS-like, e.g. SCSS, SugarCSS, Less) file using Stylelint
 you run the `stylelint` command with the file as an argument. For example:
 
     stylelint example.css
 
 For advanced usage see `stylelint --help`.
 
 In order to use stylelint-config-eyeo, your project's Stylelint configuration
 should extend from it. A minimal example looks like this:
 
     {
       "extends": "stylelint-config-eyeo"
     }
 
-If you've globally installed stylelint-config-eyeo using the `-g` flag, then 
+If you've globally installed stylelint-config-eyeo using the `-g` flag, then
 you'll need to use the absolute path to stylelint-config-eyeo in your config.
 
     {
       "extends": "/absolute/path/to/stylelint-config-eyeo"
     }
 
 For projects without a Stylelint configuration you can create your own
 personal configuration in `~/.stylelintrc.json`.