Migrate to new theme

.ci/docker/requirements.txt

@@ -1,16 +1,24 @@
 # --extra-index-url https://download.pytorch.org/whl/cu117/index.html # Use this to run/publish tutorials against the latest binaries during the RC stage. Comment out after the release. Each release verify the correct cuda version.
-# Refer to ./jenkins/build.sh for tutorial build instructions
+# Refer to ./jenkins/build.sh for tutorial build instructions.
 
-sphinx==5.3.0
+# Sphinx dependencies
+sphinx==7.2.6
 sphinx-gallery==0.17.1
 sphinx-reredirects==0.1.4
-sphinx-design==0.4.0
-docutils==0.16
-sphinx-copybutton
-sphinx_sitemap==2.6.0
-pypandoc==1.12
-pandocfilters
-markdown
+sphinx_design==0.6.1
+docutils>=0.18.1,<0.21
+sphinx-copybutton==0.5.2
+sphinx_sitemap==2.7.1
+sphinxcontrib-mermaid==1.0.0
+sphinxcontrib.katex==0.9.10
+pypandoc==1.15
+pandocfilters==1.5.1
+markdown==3.8.2
+
+# PyTorch Theme
+-e git+https://github.com/pytorch/pytorch_sphinx_theme.git@pytorch_sphinx_theme2#egg=pytorch_sphinx_theme2
+
+# Tutorial dependencies
 tqdm==4.66.1
 numpy==1.24.4
 matplotlib