Add syntax highlighting for sass and scss files

[milosevicdavid]

Expected Behavior

Syntax highlighting in scss files should behave like in css files.

Css class and id selectors in scss files should be green and punctuation marks should be red.

Current Behavior

Css selectors are light blue and punctuation marks are light blue

This should be improved because nowdays everyone uses css pre-processors instead of vanilla css.

Context

This is the most beautiful theme on the internet and I am a frontend developer that works with scss a lot.

My Environment

• vim, neovim, gVim, MacVim, ...?: Neovim
• Version used: v0.4.4
• Environment name and version (terminal, tmux, ...): Gnome Terminal 3.38
• Operating System and version: Solus Linux 4.1