Populate vim which-key

[brunofavs]

I find myself forgetting lots of useful features I have used in the past, like surround, vim-spider, auto align, etc.

These are super powerful plugins that I seldom use, thus I keep forgetting. However these are godlike when they are needed. If I had vim which-key populated, it would be easier to check these.

    wk.register({
      ["<leader>"] = {
        s = {
          b = {"Show buffers" },
        },
      },
    })