docs: add pipeline overview diagram

[sirmc]

Add initial diagram with overview of the whole pipeline. Very ugly at the moment, feel free to prettify, but the different parts should all be contained here.

[il-steffen]

thanks a lot! we can try to align a bit more with the workstream_overview.md. I spotted two things:

• input to fuzzing is not just linux-guest but a set of resources/harness definition
  • initrd, disk.img, sharedir => created by make prepare
  • harness-specific fuzzer config, kernel config, and sharedir customization (init_harness.py)
  • linux kernel build according to above defined config (./fuzz.sh build)
• execution of smatch tool itself is also encapsulated in smatch_audit.sh (it is currently called via make prepare but we may want to separate this)

[il-steffen]

We can also add the summize.sh and stats.py next to smatcher at the every bottom. They take input from workdir corpus + logs to produce the crash/findings and performance overview.

@Wenzel do you want to redo this in markdown/github or do we just update the picture and merge?

[Wenzel]

Thanks @sirmc for the diagram, it's very valuable for me ! we can merge this for now, and I can update this in a markdown/mermaid version later on.