docs: Improve demo and troubleshooting sections #459

Job	Run time
License checks for SIL Kit sources	14s
License checks for SIL Kit sources	21s
Format checks for SIL Kit sources	41s
Format checks for SIL Kit sources	39s
check-run-builds	3s
check-run-builds	3s
Thread Sanitizer Tests	0s
Address Sanitizer Tests	0s
macos-release-builds	0s
Undefined Behavior Sanitizer Tests	0s
mingw-release-builds	0s
ubuntu-arm-release-builds	0s
ubuntu-release-builds	0s
windows-release-builds	0s
Undefined Behavior Sanitizer Tests / Undefined Behavior Sanitizer Tests	27m 39s
Address Sanitizer Tests / clang-asan	20m 42s
macos-release-builds / build-macos	11m 50s
Thread Sanitizer Tests / Thread Sanitizer Tests	17m 13s
mingw-release-builds / msys2/mingw64 x86_64	20m 34s
ubuntu-arm-release-builds / clang-18 release Builds for Ubuntu ARM64	8m 12s
ubuntu-release-builds / clang-18 release Builds for Ubuntu	15m 55s
windows-release-builds / build-win-x32	21m 38s
ubuntu-release-builds / gcc release Builds for Ubuntu	15m 47s
windows-release-builds / build-win-x64	22m 37s
	3h 4m 8s

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