Changes from dnn-theme-boostrap3-instant to dnn-theme-bootstrap4-instant

removed bower (deprecated), uses npm now
- Dependencies moved from bower.json to package.json
- Files are now located in node_modules instead of bower_components
- Versions are locked with package.lock
Renamed classes which were changed by bootstrap, including
- pull-left > float-left
- hidden-* > d-none, d-lg-block
- Breakpoint shift: Moved all classes
Breakpoint shift: Moved media queries
- Bootstrap 4 added a new breakpoint for 576px+
- Bootstrap 4 breakpoint sizes have shifted (sm is now md, md is now lg, lg is now xl)
Media queries with @include
- before: @media (min-width: $screen-sm-min)
- after: @include media-breakpoint-up(md)
Fixed issue in package.json (comments are not allowed)
Removed separate typography.css from dist because we don't need this anymore
Main (desktop) menu: added classes nav-link (li>a) and nav-item (li)
Nav-sub: removed bootstrap class because it had no effect
Variables: Bootstrap 4 has renamed and changed variables - took new variables file and moved existing variables (if existed) to new version
- For variables that did not exist: defined variable in variables_2sic
- Changed $brand-primary to theme-color("primary") globally
- $gray is now $gray-100, there are more grayscales in bs4
Removed Glyphicons and switched to FontAwesome
- renamed all icon classes from glyphicons-* to fa-*
Removed old shim files for IE9-

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