Repository navigation

Tidied up contrib/masterfiles-stage/README.org #2943

Job	Run time
unit_tests / Run Unit Tests	2m 55s
shellcheck_tests / Run shellcheck on shell scripts	1m 4s
valgrind_tests / valgrind_tests	5m 51s
macos_unit_tests / macos_unit_tests	3m 10s
acceptance_tests / acceptance_tests	44m 4s
asan_unit_tests / asan_unit_tests	2m 50s
static_check / static_check	11m 44s
valgrind_check / valgrind_check	4m 46s
	1h 16m 24s