emmet-ls support

[sei40kr]

Describe your request

Currently :lang web and :lang javascript have Emmet support with emmet-mode.
But emmet-mode has no fuzzy matching which is a very important feature cause to help us to remember the abbreviations for CSS properties.
In addition, the author of emmet-mode said emmet-mode will be no longer maintained.

So I want emmet-ls support in Doom Emacs.
It works as an add-on LSP server, and provides Emmet expansions as the LSP snippets.

FYI emmet-ls support was merged into lsp-mode via emacs-lsp/lsp-mode#3384.

Briefly explain its use-case

1. Install Doom Emacs
2. Install emmet-ls
3. Open a CSS file
4. Type some Emmet abbreviation and expand it