docs(blog): add usage section for axios-to-fetch article (#8914)

* docs(blog): add usage section for axios-to-fetch article

* Add link to the source code of this codemod
* Add link to the codemod registry
* Add usage command

Signed-off-by: Jean de Barochez <3436890+jdebarochez@users.noreply.github.com>

* docs: remove trailing colon in header

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Jean de Barochez <3436890+jdebarochez@users.noreply.github.com>

---------

Signed-off-by: Jean de Barochez <3436890+jdebarochez@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: jdebarochez

apps/site/pages/en/blog/migrations/axios-to-fetch.mdx

@@ -41,6 +41,16 @@ The codemod supports the following Axios methods and converts them to their Fetc
 - `axios.putForm(url[, data[, config]])`
 - `axios.patchForm(url[, data[, config]])`
 
+## Usage
+
+The source code for this codemod can be found in the [axios-to-whatwg-fetch directory](https://github.com/nodejs/userland-migrations/tree/main/recipes/axios-to-whatwg-fetch).
+
+You can find this codemod in the [Codemod Registry](https://app.codemod.com/registry/@nodejs/axios-to-whatwg-fetch).
+
+```bash
+npx codemod @nodejs/axios-to-whatwg-fetch
+```
+
 ## Examples
 
 ### GET Request