Generating docs: `pandoc` required

Please provide the following

• Machine and OS: Ubuntu 22.04 VM
• binary_c: stable v2.2.3
• binary_c-python: v0.9.6

Generating the docs using the generate_docs.sh script errored out at first since pandoc is required to convert the notebooks. Might be good to state this simply in the documentation. Installing it via apt solved the issue and all is good.