Automatically build combined yaml file

[d70-t]

This PR automatically builds a combined yaml file for all segmented flights (and supposedly publishes it on github pages if run on the main branch).

It does so by

• executing all segmentation notebooks via jupytext --execute
• joining the resulting files using yq
• using a Makefile for coordination and parallelization

For faster data retrieval, the IPFS node running in CI will proactively peer with known peers of the orcestra campaign.

[tmieslinger]

Thanks for adding a workflow to concatenate and publish the flight segments! I tested the makefile, which nicely produces the all_flights.yaml and the workflow part I just read and couldn't find anything obviously strange. So I'll merge it and we will see what happens :)