Point the site URLs at the GitHub Pages address actually served

baseurl claimed https://python-programming-fa.quantecon.org/, a host
that does not resolve, so every page emitted a canonical and og:url to
a dead address while the site serves from github.io. The two
tojupyter paths carried the same dead host.

This edition is hosted at its GitHub Pages URL while the broader URL
structure is decided, so the config now says so.

Also drops nb_repository_url, which pointed at
lecture-python-programming.fa.notebooks — a repository that does not
exist. Mirrors the comment the fr edition already uses; the theme
skips notebook-launch links when the option is unset.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: mmcky

lectures/_config.yml

@@ -8,7 +8,7 @@ execute:
   timeout: 600 # 10 minutes
 
 html:
-  baseurl: https://python-programming-fa.quantecon.org/
+  baseurl: https://quantecon.github.io/lecture-python-programming.fa/
 
 latex:
   latex_documents:
@@ -55,7 +55,8 @@ sphinx:
       header_organisation_url: https://quantecon.org
       header_organisation: QuantEcon
       repository_url: https://github.com/QuantEcon/lecture-python-programming.fa
-      nb_repository_url: https://github.com/QuantEcon/lecture-python-programming.fa.notebooks
+      # nb_repository_url omitted deliberately: no notebooks repo exists for this
+      # edition yet, and the theme skips notebook-launch links when it is unset
       path_to_docs: lectures
       twitter: quantecon
       twitter_logo_url: https://assets.quantecon.org/img/qe-twitter-logo.png
@@ -74,8 +75,8 @@ sphinx:
       index_toc.md: intro.md
     tojupyter_static_file_path: ["source/_static", "_static"]
     tojupyter_target_html: true
-    tojupyter_urlpath: "https://python-programming-fa.quantecon.org/"
-    tojupyter_image_urlpath: "https://python-programming-fa.quantecon.org/_static/"
+    tojupyter_urlpath: "https://quantecon.github.io/lecture-python-programming.fa/"
+    tojupyter_image_urlpath: "https://quantecon.github.io/lecture-python-programming.fa/_static/"
     tojupyter_lang_synonyms: ["ipython", "ipython3", "python"]
     tojupyter_kernels:
       python3: