Merge branch 'main' into exercise-checking

.gitlab-ci.yml

README.md

book/_toc.yml

book/cookbook/benchmarks/benchmark_aux_dont_execute.ipynb

book/cookbook/benchmarks/nested/__init__.py

book/cookbook/benchmarks/nested/nested/__init__.py

book/cookbook/benchmarks/nested/nested/nested_library.py

book/cookbook/blank.md

book/cookbook/live_code.md

book/intro.md

book/new/blank.md

book/programming/code/overview.md

book/programming/communication/overview.md

book/programming/computers/overview.md

book/programming/golden_rules_dont_execute.ipynb

book/programming/overview.md

book/programming/programs/overview.md

book/sandbox/SanPart/ObservationTheory/01_Introduction.md

book/sandbox/SanPart/ObservationTheory/02_LeastSquares.md

book/sandbox/SanPart/ObservationTheory/03_WeightedLSQ.md