docs: Add zig lsp options

[divakaivan]

The Zig LSP config options are missing and it's unclear based on the Zig LSP docs what they are.

I am not sure which are the defalt options, but I went through all the zig lsp configs I could find on youtube and these are the options I found.

An additional chunk which auto formats imports is:

vim.api.nvim_create_autocmd("BufWritePre", {
  pattern = { "*.zig", "*.zon" },
  callback = function(ev)
    vim.lsp.buf.code_action({
      context = { only = { "source.organizeImports" } },
      apply = true,
    })
  end,
})

and it can be added above the usual return {...}, at the top of the file. Not sure if there is an option for that instead of this chunk which I got from the official docs.

[divakaivan]

I am not sure what are all the options here...

[divakaivan]

All options are available here: https://github.com/zigtools/zls/blob/master/schema.json