Decorate my cmp & refactor my lsp config

[ShampooDeng]

I've seen some cmp users have some emoji or symbols attached to the completion candidates. So I wonder how to have one myself

[ShampooDeng]

lsp-zero's guide material may be a good start.

• https://github.com/VonHeikemen/lsp-zero.nvim/blob/v3.x/doc/md/lsp.md
• https://github.com/VonHeikemen/lsp-zero.nvim/blob/v3.x/doc/md/autocomplete.md
• https://github.com/VonHeikemen/lsp-zero.nvim/blob/v3.x/doc/md/guides/quick-recipes.md
• https://github.com/VonHeikemen/lsp-zero.nvim/blob/v3.x/doc/md/guides/under-the-hood.md