Fix doc pipeline & add documentation on running HLT1 and HLT2 over simulation

FYI @mvesteri @decianm

This MR adds a new page to the documentation to show (and explain) how to run HLT1 and HLT2 over MC. It uses literal-include to grab code for examples that are tested in the nightlies, so the code examples will not become outdated unless they stop being tested.

There's pressure from OPG to get these instructions out, so I intend to just add the page, advertise it, and fix the doc build for now. Over the next few weeks, the Moore documentation needs a bit of a top-level reorganisation, which I'll do as a follow-up.

The new web page can be found at https://rjhunter.web.cern.ch/tutorials/running_over_mc.html

I also made a few hacks to get the docs to build.

TODO:

• Improve on hacks
• Put the pages on a web space so people can see them
• Use call_allen_decision_logger() for more helpful HLT1 example
• Add a bit about what conditions_version means