Better lualine integration

[blindFS]

I found a better way to do lualine integration:

      local lualine = require("lualine")
      local config = lualine.get_config()
      table.insert(config.sections.lualine_x, require("mcphub.extensions.lualine"))
      lualine.setup(config)

In the sense that it won't override the entire lualine_x section.

[ravitemer]

Thanks @blindFS

It was supposed to serve as an example. I thought users might eventually place it where they want to place. But updating the README with this seems appropriate.

Do you want to open a PR or I can update this with next release.

[blindFS]

Sure, I can manage a PR for that.