[mikelangmayr]

• Remove the camerad/Instruments submodules and packaging/tracking; instruments build from their own repository with the core pulled in via FetchContent
• Remove the INSTRUMENT and CAMERAD_PYTHON_PACKAGE CMake options; the core always builds its controller's default factory
• Drop the instrument and submodule steps from the CMake workflow, and the ATC FITS keyword table from the docs
• Remove the per-instrument doc pages and instrument-specific examples; instruments document themselves in their own repository
• Update README and docs for the instrument-repo build
• Verified: archon core build and Python import test, reference instrument build and test, hispec-tracking-camera-instrument built against this branch with its module importing, sphinx-build -W

[astronomerdave]

Looks good, this is exactly what I was planning to do next. One thing though, instrument pages under docs/instruments stay in the core and I think they should be moved to each instrument's repo since the core shouldn't carry real instruments.