feat(snacks): use snacks.dashboard as the default dashboard. moved dashboard-nvim to extras (#4832)

## Description

<!-- Describe the big picture of your changes to communicate to the
maintainers
  why we should accept this pull request. -->

Snacks has a new dashboard plugin that will be LazyVim's default.

Check the docs at
https://github.com/folke/snacks.nvim/blob/main/docs/dashboard.md

## Related Issue(s)

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  If this PR fixes any issues, please link to the issue here.
  - Fixes #<issue_number>
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## Screenshots

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## Checklist

- [x] I've read the
[CONTRIBUTING](https://github.com/LazyVim/LazyVim/blob/main/CONTRIBUTING.md)
guidelines.

lua/lazyvim/plugins/init.lua

@@ -30,11 +30,9 @@ return {
     opts = function()
       ---@type snacks.Config
       return {
+        bigfile = { enabled = true },
         notifier = { enabled = true },
         quickfile = { enabled = true },
-        bigfile = { enabled = true },
-        words = { enabled = true },
-        toggle = { map = LazyVim.safe_keymap_set },
         statuscolumn = { enabled = false }, -- we set this in options.lua
         terminal = {
           win = {
@@ -46,6 +44,8 @@ return {
             },
           },
         },
+        toggle = { map = LazyVim.safe_keymap_set },
+        words = { enabled = true },
       }
     end,
     keys = {