chore(package): simplified dependencies

[chemzqm]

vscode-languageserver and vscode-languageclient are not needed.
Use devDependencies to avoid install dependencies when using :CocInstall

[rodrigore]

Wow, such a honor to have it here @chemzqm. Thank you so much for the pull request, but I use the vscode-languageserver and vs-code-languageclient only to build and compile the intellisense submodule. So, If I remove those dependencies, the build process will fail.

Maybe is not the best way, but I include the intellisense repo as a submodule, then install dependencies, and then compile to generate the server code in this folder: lib-server/intellisense/packages/tailwindcss-intellisense/src/server/

Maybe you can help me or guide me to make things more simple, and maybe avoid this compile steps, in order to make more clear and simple the coc extension.