Revert "Add smallpt as an example notebook" #1354

Job	Run time
emscripten_wasm (ubu24, ubuntu-24.04-arm, 3.1.45, bash)	1m 50s
emscripten_wasm (ubu24, ubuntu-24.04-arm, 3.1.45, bash)	1m 50s
build (ubu24, ubuntu-24.04, bash)	1m 26s
build (ubu24, ubuntu-24.04, bash)	1m 26s
emscripten_wasm (osx15-arm, macos-15, 3.1.45, bash)	2m 35s
emscripten_wasm (osx15-arm, macos-15, 3.1.45, bash)	2m 35s
build (ubu24-arm, ubuntu-24.04-arm, bash)	11s
build (ubu24-arm, ubuntu-24.04-arm, bash)	1m 9s
build (ubu24-analyzers, ubuntu-24.04, true, -DCMAKE_BUILD_TYPE=Debug, bash)	3m 28s
build (ubu24-analyzers, ubuntu-24.04, true, -DCMAKE_BUILD_TYPE=Debug, bash)	3m 28s
build (ubu22, ubuntu-22.04, bash)	1m 21s
build (ubu22, ubuntu-22.04, bash)	1m 21s
build (ubu22-arm, ubuntu-22.04-arm, bash)	1m 9s
build (ubu22-arm, ubuntu-22.04-arm, bash)	1m 9s
build (osx13-x86, macos-13, bash)	3m 6s
build (osx13-x86, macos-13, bash)	3m 6s
build (osx14-arm, macos-14, bash)	1m 46s
build (osx14-arm, macos-14, bash)	1m 46s
build (osx15-arm, macos-15, bash)	1m 14s
build (osx15-arm, macos-15, bash)	1m 14s
build (Windows22, windows-2022, cmd.exe)	3m 33s
build (Windows22, windows-2022, cmd.exe)	3m 33s
build (Windows25, windows-2025, cmd.exe)	2m 17s
build (Windows25, windows-2025, cmd.exe)	2m 17s
	48m 50s

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