Snacks: ignore file patterns in picker

[practicalli-johnny]

Example of adding ignore patterns to the snacks picker

Note that .gitignore patterns should be respected (to test)

Example also arranges picker verically

return {
  "folke/snacks.nvim",
  opts = {
    picker = {
      layout = {
        preset = "vertical",
      },
      files = {

        exclude = {
          "^node_modules/",
          "^node_",
          "^.git/",
          "^target/",
          "^build/",
          "^dist/",
          "^vendor/",
          "^__pycache__/",
        },
      },
    },
  },
}