Replace non-functional Bitbucket URLs

- ``sphinx-contrib`` has moved to GitHub
- Replace personal project links with links to the Bitbucket archive

doc/faq.rst

@@ -40,7 +40,7 @@ How do I...
 For many more extensions and other contributed stuff, see the sphinx-contrib_
 repository.
 
-.. _sphinx-contrib: https://bitbucket.org/birkenfeld/sphinx-contrib/
+.. _sphinx-contrib: https://github.com/sphinx-contrib/
 
 .. _usingwith:
 
@@ -63,7 +63,8 @@ Doxygen
 
 SCons
    Glenn Hutchings has written a SCons build script to build Sphinx
-   documentation; it is hosted here: https://bitbucket.org/zondo/sphinx-scons
+   documentation; it is hosted here:
+   https://bitbucket-archive.softwareheritage.org/projects/zo/zondo/sphinx-scons.html
 
 PyPI
    Jannis Leidel wrote a `setuptools command
@@ -77,8 +78,8 @@ GitHub Pages
    GitHub Pages on building HTML document automatically.
 
 MediaWiki
-   See https://bitbucket.org/kevindunn/sphinx-wiki/wiki/Home, a project by
-   Kevin Dunn.
+   See https://bitbucket-archive.softwareheritage.org/projects/ke/kevindunn/sphinx-wiki.html,
+   a project by Kevin Dunn.
 
 Google Analytics
    You can use a custom ``layout.html`` template, like this:

doc/usage/restructuredtext/domains.rst

@@ -2179,5 +2179,5 @@ Jinja_, Operation_, and Scala_.
 .. _MATLAB: https://pypi.org/project/sphinxcontrib-matlabdomain/
 .. _Operation: https://pypi.org/project/sphinxcontrib-operationdomain/
 .. _PHP: https://pypi.org/project/sphinxcontrib-phpdomain/
-.. _Ruby: https://bitbucket.org/birkenfeld/sphinx-contrib/src/default/rubydomain
+.. _Ruby: https://github.com/sphinx-contrib/rubydomain
 .. _Scala: https://pypi.org/project/sphinxcontrib-scaladomain/