This restructures the doc as a tutorial leading newcomers to becoming experimented users.
It adds pages on:
- how to get started with Cartographer on a new .bag
- how Cartographer works and can be tuned step-by-step
- how to use "extra" features of Cartographer
- how to contribute to Cartographer
It also provides some cosmethic changes with: new titles, non-indented code blocks, various illustrations, reworked paragraphs for clarity...
This will allow us to keep way less information in memory for SLAMing and fixes crashes related to multi trajectory (e.g. this fixes#413).
It also means that to get to an X-Ray or a map, users need to run the asset writer now after SLAMing, which is inconvenient.
Remove dependency on YAML and delete more dead code.