Make README.md point to INSTALL.md for instructions #4433

Job	Run time
run-lint	42s
build-container-image	6s
Download and cache Tesseract data	6s
build-install-rpm (fedora 39)	7m 9s
build-deb (ubuntu 20.04)	2m 30s
build-install-rpm (fedora 40)	6m 15s
build-deb (ubuntu 22.04)	3m 47s
build-install-rpm (fedora 41)	5m 53s
build-deb (ubuntu 24.04)	2m 26s
build-deb (ubuntu 24.10)	2m 30s
build-deb (debian bullseye)	2m 36s
build-deb (debian bookworm)	2m 53s
build-deb (debian trixie)	2m 36s
macOS (arch64)	2m 20s
windows	9m 26s
run tests (ubuntu 20.04)	5m 35s
macOS (x86_64)	3m 47s
run tests (ubuntu 22.04)	5m 41s
run tests (ubuntu 24.04)	5m 7s
run tests (ubuntu 24.10)	5m 17s
run tests (debian bullseye)	5m 49s
run tests (debian bookworm)	5m 20s
run tests (debian trixie)	5m 18s
run tests (fedora 39)	5m 33s
run tests (fedora 40)	5m 19s
run tests (fedora 41)	5m 29s
install-deb (ubuntu 20.04)	3m 43s
install-deb (ubuntu 22.04)	4m 0s
install-deb (ubuntu 24.04)	2m 46s
install-deb (ubuntu 24.10)	2m 32s
install-deb (debian bullseye)	3m 6s
install-deb (debian bookworm)	2m 36s
install-deb (debian trixie)	2m 30s
	2h 10m 43s

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