Update sample files

* Update CSS and HTML
* Add SCSS
Extend for SCSS support
Extend and modify `@` rules CSS support
Modify `@media, @import, @supports`
Adjust JS function arguments display

Current coloring will be used as number coloring.
Adjust number coloring for JS and PHP

CSS was left as it is since this color will be probably used as preprocessor variable (e.g. SCSS).
Also, there is too much noise right now so it’s best to leave it as it is.