[added] strikethrough support in rst

Dockerfile

@@ -5,13 +5,13 @@
 #
 # This creates an image to compile different forms of the HDR with sphinx into pdf and html
 #
-# build with $ docker build -t mysphinx:001
+# build with $ docker build -t mysphinx:001 .
 
 FROM sphinxdoc/sphinx-latexpdf
 
 RUN python -m pip install pip -U && \
       pip install --upgrade myst-parser && \
-      pip install sphinx-rtd-theme sphinxcontrib-fulltoc linkify-it-py
+      pip install sphinx-rtd-theme sphinxcontrib-fulltoc linkify-it-py sphinxnotes-strike
 
 # Use according to https://hub.docker.com/r/sphinxdoc/sphinx
 # (batch) > docker run --rm -v %cd%:/docs mysphinx:001 make latexpdf