Fix broken Sphinx link in footer (#1234)

* Fix broken sphinx link in footer

* Update Sphinx link in translation files

Author: vkbo

src/pydata_sphinx_theme/locale/en/LC_MESSAGES/sphinx.po

@@ -124,7 +124,7 @@ msgstr ""
 #: src/pydata_sphinx_theme/theme/pydata_sphinx_theme/components/sphinx-version.html:3
 #, python-format
 msgid ""
-"Created using <a href=\"https://sphinx-doc.org/\">Sphinx</a> "
+"Created using <a href=\"https://www.sphinx-doc.org/\">Sphinx</a> "
 "%(sphinx_version)s."
 msgstr ""
 

src/pydata_sphinx_theme/locale/es/LC_MESSAGES/sphinx.po

@@ -125,7 +125,7 @@ msgstr "Mostrar el código"
 #: src/pydata_sphinx_theme/theme/pydata_sphinx_theme/components/sphinx-version.html:3
 #, python-format
 msgid ""
-"Created using <a href=\"https://sphinx-doc.org/\">Sphinx</a> "
+"Created using <a href=\"https://www.sphinx-doc.org/\">Sphinx</a> "
 "%(sphinx_version)s."
 msgstr ""
 "Creado usando <a href=\"https://www.sphinx-doc.org/\">Sphinx</a> "

src/pydata_sphinx_theme/locale/fr/LC_MESSAGES/sphinx.po

@@ -125,7 +125,7 @@ msgstr "Montrer le code source"
 #: src/pydata_sphinx_theme/theme/pydata_sphinx_theme/components/sphinx-version.html:3
 #, python-format
 msgid ""
-"Created using <a href=\"https://sphinx-doc.org/\">Sphinx</a> "
+"Created using <a href=\"https://www.sphinx-doc.org/\">Sphinx</a> "
 "%(sphinx_version)s."
 msgstr ""
 "Créé en utilisant <a href=\"https://www.sphinx-doc.org/\">Sphinx</a> "

src/pydata_sphinx_theme/locale/sphinx.pot

@@ -124,7 +124,7 @@ msgstr ""
 #: src/pydata_sphinx_theme/theme/pydata_sphinx_theme/components/sphinx-version.html:3
 #, python-format
 msgid ""
-"Created using <a href=\"https://sphinx-doc.org/\">Sphinx</a> "
+"Created using <a href=\"https://www.sphinx-doc.org/\">Sphinx</a> "
 "%(sphinx_version)s."
 msgstr ""
 

src/pydata_sphinx_theme/theme/pydata_sphinx_theme/components/sphinx-version.html

@@ -1,6 +1,6 @@
 {% if show_sphinx %}
   <p class="sphinx-version">
-    {% trans sphinx_version=sphinx_version|e %}Created using <a href="https://sphinx-doc.org/">Sphinx</a> {{ sphinx_version }}.{% endtrans %}
+    {% trans sphinx_version=sphinx_version|e %}Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> {{ sphinx_version }}.{% endtrans %}
     <br/>
   </p>
 {% endif %}