use qiskit.org/textbook in logo-link

_config.yml

@@ -35,7 +35,7 @@ footer_text               : This page was created by <a href="https://github.com
 show_sidebar              : true  # Show the sidebar. Only set to false if your only wish to host a single page.
 collapse_inactive_chapters: true  # Whether to collapse the inactive chapters in the sidebar
 textbook_logo             : images/logo/logo.png  # A logo to be displayed at the top of your textbook sidebar. Should be square
-textbook_logo_link        : https://delapuente.github.io/qiskit-textbook  # A link for the logo.
+textbook_logo_link        : https://qiskit.org/textbook  # A link for the logo.
 sidebar_footer_text       : 'Powered by <a href="https://github.com/jupyter/jupyter-book">Jupyter Book</a>'
 number_toc_chapters       : true  # Whether to add numbers to chapterse in your Table of Contents. If true, you can control this at the Chapter level in _data/toc.yml