docs(web/guides): name the dead cfwheels-base-template slug and redirect to wheels-base-template (#3253)

The Installing with CommandBox page existed to give 2.x/3.x CommandBox
teams a clear Wheels 4 answer, but it never mentioned the slug a
migrating 2.x user actually has in muscle memory:
`box install cfwheels-base-template`. That pre-rebrand slug still
resolves on ForgeBox (76,754 installs, top 'cfwheels' search hit) but
errors on its missing `cfwheels` core dependency and leaves an
unrunnable skeleton.

Worse, the 2.x/3.x migration table claimed
`box install wheels-base-template` + `wheels-core` was 'Unchanged' —
inaccurate for a genuine 2.x user, whose slug DID change
(cfwheels-base-template -> wheels-base-template). The row now reads
'Slug changed' and a caution Aside maps the dead cfwheels- prefixed
slugs to the supported 4.x slugs (cfwheels-base-template ->
wheels-base-template, cfwheels -> wheels-core).

Refs #3198 (post-merge review finding)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Signed-off-by: Peter Amiri <petera@pai.com>
Co-authored-by: Peter Amiri <petera@pai.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: 3 people

web/sites/guides/src/content/docs/v4-0-0/start-here/installing-with-commandbox.mdx

@@ -124,7 +124,20 @@ The 3.x getting-started spine was built on CommandBox. Here's how each old step
 | `wheels generate app myApp` / `wheels g app` | `wheels new myApp` |
 | `box server start` | Still works — or `wheels start` (Lucee, bundled with the CLI) |
 | ForgeBox plugins (`box install ...`, `forgebox install`) | The [`wheels packages`](/v4-0-0/digging-deeper/packages/) registry (CLI-only; not ForgeBox) |
-| `box install wheels-base-template` + `wheels-core` | Unchanged — still the supported way to fetch the framework with CommandBox |
+| `box install cfwheels-base-template` | **Slug changed** — `box install wheels-base-template` (the `cfwheels-`-prefixed slug is dead; see below) |
+
+<Aside type="caution" title="The `cfwheels-base-template` slug is gone — use `wheels-base-template`">
+If your 2.x muscle memory is `box install cfwheels-base-template`, that command no longer works. The pre-rebrand `cfwheels-`-prefixed ForgeBox slugs (`cfwheels-base-template`, `cfwheels`) are **deprecated and unmaintained** — `cfwheels-base-template` still resolves on ForgeBox but errors on its missing `cfwheels` core dependency and leaves an unrunnable skeleton. The framework rebranded to **Wheels** at 3.0, and the supported 4.x slugs dropped the prefix:
+
+- `cfwheels-base-template` → [`wheels-base-template`](#supported-install-the-framework)
+- `cfwheels` → `wheels-core`
+
+Install the modern slug instead:
+
+```bash title="illustrative — the supported 4.x slug"
+box install wheels-base-template
+```
+</Aside>
 
 The practical recommendation: keep CommandBox if you rely on it for Adobe CF or BoxLang server management, and add the `wheels` CLI alongside it for everything in the [feature-set list above](#not-supported-via-commandbox-the-wheels-cli-feature-set).