FIX: update Jupyter Book links to avoid redirects (#337)

Updated jupyterbook.org links from /en/stable/ to /v1/ to avoid
redirect chains that cause linkchecker warnings.

- layout.html footer: https://jupyterbook.org/en/stable/ → /v1/
- docs/reference/markdown_limits.md: removed broken FAQ link
- docs/layout.md: beta.jupyterbook.org → jupyterbook.org/v1/

Author: mmcky

docs/layout.md

@@ -204,7 +204,7 @@ I could try to add a list of ideas to talk about.
 I suppose I could just keep going on forever,
 but I'll stop here.
 
--- Jo the Jovyan, *[the jupyter book docs](https://beta.jupyterbook.org)*
+-- Jo the Jovyan, *[the jupyter book docs](https://jupyterbook.org/v1/)*
 ```
 
 `````{toggle}

docs/reference/markdown_limits.md

@@ -800,7 +800,7 @@ docker run --rm --security-opt label:disable  \
 If you navigate to `http://0.0.0.0:4000/jupyter-book/` in your browser,
 you should see a preview copy of your book.
 If you instead see an error, please try to update your local book;
-see [the Jupyter Book FAQ section](https://jupyterbook.org/guide/04_faq.html#how-can-i-update-my-book)
+see [the Jupyter Book documentation](https://jupyterbook.org/v1/)
 for more details on how to do so.
 
 ##### Building your site locally with Containers: Singularity

src/quantecon_book_theme/theme/quantecon_book_theme/layout.html

@@ -150,7 +150,7 @@
                                 {% endif %}
                             </p>
 
-                            <p class="powered">Powered by <a href="https://jupyterbook.org/en/stable/">Jupyter Book</a></p>
+                            <p class="powered">Powered by <a href="https://jupyterbook.org/v1/">Jupyter Book</a></p>
 
                         </nav>