Updating chapter 24 Outside-In #1486

Job	Run time
chapter-tests (test_chapter_01)	1m 24s
chapter-tests (test_chapter_02_unittest)	1m 14s
chapter-tests (test_chapter_03_unit_test_first_view)	1m 32s
chapter-tests (test_chapter_04_philosophy_and_refactoring)	2m 2s
chapter-tests (test_chapter_05_post_and_database)	2m 26s
chapter-tests (test_chapter_06_explicit_waits_1)	1m 57s
chapter-tests (test_chapter_07_working_incrementally)	4m 36s
chapter-tests (test_chapter_08_prettification)	2m 26s
chapter-tests (test_chapter_09_docker)	2m 40s
chapter-tests (test_chapter_10_production_readiness)	3m 4s
chapter-tests (test_chapter_11_server_prep)	1m 8s
chapter-tests (test_chapter_12_ansible)	1m 21s
chapter-tests (test_chapter_13_organising_test_files)	2m 11s
chapter-tests (test_chapter_14_database_layer_validation)	4m 4s
chapter-tests (test_chapter_15_simple_form)	3m 38s
chapter-tests (test_chapter_16_advanced_forms)	3m 30s
chapter-tests (test_chapter_17_javascript)	2m 29s
chapter-tests (test_chapter_19_spiking_custom_auth)	2m 4s
chapter-tests (test_chapter_20_mocking_1)	2m 8s
chapter-tests (test_chapter_21_mocking_2)	2m 29s
chapter-tests (test_chapter_22_fixtures_and_wait_decorator)	1m 59s
chapter-tests (test_chapter_23_debugging_prod)	2m 40s
chapter-tests (test_chapter_24_outside_in)	1m 42s
chapter-tests (test_chapter_25_CI)	1m 50s
chapter-tests (test_chapter_26_page_pattern)	1m 23s
	57m 57s

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