Build book only once and cache notebooks (#34)

* Do not build book within each iteration of demo conversion in Makefile

* Chache notebooks rather than forcing execution every time we rebuild the docs

Author: finsberg

Makefile

@@ -6,8 +6,8 @@ doc: # Generate Sphinx HTML documentation, including API docs
 # We use --set-kernel with jupytext to make it possible for binder to pick it up
 	@for demo in ${DEMOS}; do \
 		jupytext --to=ipynb --set-kernel=python3 demo/$$demo.py --output=docs/$$demo.ipynb ;\
-		jupyter book build -W docs ;\
 	done
+	jupyter book build -W docs
 
 clean-pytest: # Remove output from pytest
 	rm -rf .pytest_cache

docs/_config.yml

@@ -9,8 +9,7 @@ copyright: "2022"
 # Force re-execution of notebooks on each build.
 # See https://jupyterbook.org/content/execute.html
 execute:
-  execute_notebooks: force
-
+  execute_notebooks: cache
 
 # Information about where the book exists on the web
 repository: