Update link to jupyterlab-code-formatter doc (jupyterlab-contrib#32)

Author: fcollonval

migrate_from_classical.md

@@ -18,7 +18,7 @@ to [JupyterLab](https://jupyterlab.readthedocs.io/en/stable/).
 | [Cell Filter](https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/nbextensions/cell_filter/README.html) | Built-in Table of Contents heading cells can be filtered by cell tags | 2.2+ |
 | [cite2c](https://github.com/takluyver/cite2c) | [jupyterlab-citation-manager](https://github.com/krassowski/jupyterlab-citation-manager) extension | 3+ |
 | [Code Font Size](https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/nbextensions/code_font_size/README.html) | Built-in feature (View -> Presentation Mode or Settings -> JupyterLab Theme) | 1+ |
-| [Code prettify](https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/nbextensions/code_prettify/README_code_prettify.html) | [jupyterlab_code_formatter](https://jupyterlab-code-formatter.readthedocs.io/en/latest/index.html) extension | 1+ |
+| [Code prettify](https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/nbextensions/code_prettify/README_code_prettify.html) | [jupyterlab_code_formatter](https://ryantam626.github.io/jupyterlab_code_formatter/index.html) extension | 1+ |
 | [Codefolding](https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/nbextensions/codefolding/readme.html) | Built-in feature (Advanced Settings -> Notebook -> codeCellConfig.codeFolding) | 1+ |
 | [Codefolding in Editor](https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/nbextensions/codefolding/readme.html) | Built-in feature (Advanced Settings -> Text Editor -> editorConfig.codeFolding) | 1+ |
 | [Collapsible Headings](https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/nbextensions/collapsible_headings/readme.html) | Built in feature since 3.1 ([PR](https://github.com/jupyterlab/jupyterlab/pull/10260)), for older versions use [aquirdturtle_collapsible_headings](https://github.com/aquirdTurtle/Collapsible_Headings) extension | 1+ |