Remove laravel build and manuell build steps for design changes (prebid#4961)

* Remove laravel build and manuell build steps for design changes

* Remove unused configs in _config.yml

---------

Co-authored-by: bretg <bgorsline@gmail.com>

Author: muuki88

.bowerrc

@@ -13,6 +13,7 @@ Gemfile.lock
 
 # Files generated by `npm install`
 node_modules/
+!_sass/node_modules
 /.vs/prebid.github.io/v17/.suo
 /.vs/slnx.sqlite
 /.vs

.gitignore

@@ -41,11 +41,11 @@ The site is hosted on GitHub pages, and uses [Jekyll](https://jekyllrb.com/) to
 1. gem install github-pages
 1. start Jekyll as described below
 
-For CSS, the site uses Laravel Mix to build CSS from Sass (scss-flavored) source files. Under the hood Laravel Mix uses Webpack.
+For CSS, the site uses Jekyll board tools to compile SCSS down to CSS.
 
-1. follow the instructions at [/nodejs.dev](https://nodejs.dev) to install Node.js for your OS
-1. `npm ci` to install packages for building assets
-1. build assets as described below
+1. Install `boostrap` via `npm install` to make the build work
+1. [Jekyll assets management](https://jekyllrb.com/docs/assets/)
+1. [Jekyll SASS plugin](https://jekyllrb.com/docs/configuration/sass/)
 
 The markdown files are linted via [markdownlint-cli](https://github.com/igorshubovych/markdownlint-cli). VSCode supports the [.markdownlintignore](.markdownlintignore) file.
 You may need to configure the disabled rules specified in [.markdownlint.json](.markdownlint.json) directly in your project settings. You can invoke linting in CLI via

.sass-cache/a8ae1fbf8fe3cf0ae44282e4f927a25624204c54/main.scssc

@@ -87,7 +87,8 @@ collections:
 
 port: 8080
 
-exclude: ['README.md', 'LICENSE', 'bower.json', 'Gemfile.lock', 'Gemfile', 'vendor', 'node_modules', '_assets', 'mix-manifest.json', 'webpack.mix.js', 'find-ungrouped-bidders.sh' ]
+exclude: ['README.md', 'LICENSE', 'Gemfile.lock', 'Gemfile', 'vendor', 'find-ungrouped-bidders.sh' ]
+include: ['node_modules']
 
 keep_files:
   - assets/css/main-bundle.css