Updates the modularization guide with TGUI instructions (#25514) #93

Job	Run time
Collect data for other tasks	13s
Run Linters	2m 2s
Compile Maps	3m 11s
Windows Build	2m 6s
Check Alternate Tests	0s
Integration Tests (birdshot) / run_integration_tests	11m 31s
Integration Tests (blueshift) / run_integration_tests	12m 28s
Integration Tests (deltastation) / run_integration_tests	11m 4s
Integration Tests (gateway_test) / run_integration_tests	12m 45s
Integration Tests (icebox) / run_integration_tests	11m 40s
Integration Tests (metastation) / run_integration_tests	10m 53s
Integration Tests (multiz_debug) / run_integration_tests	10m 51s
Integration Tests (northstar) / run_integration_tests	12m 37s
Integration Tests (tramstation) / run_integration_tests	11m 27s
Integration Tests (runtimestation) / run_integration_tests	9m 54s
Integration Tests (voidraptor) / run_integration_tests	10m 55s
Compare Screenshot Tests	1m 21s
	2h 14m 58s

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