Change default layers to use lowercase directories #2814

Job	Run time
ci (ubuntu-22.04, 8, 2.13.15, 2.4, 7.0) / compile project with mill	3m 50s
ci (ubuntu-22.04, 8, 2.13.15, 2.4, 7.0) / ci	20m 57s
ci (ubuntu-22.04, 8, 2.13.15, 2.4, 7.0) / Formatting	1m 30s
ci (ubuntu-22.04, 8, 2.13.15, 2.4, 7.0) / Benchmarking Sanity Check	2m 41s
ci (ubuntu-22.04, 8, 2.13.15, 2.4, 7.0) / Integration Tests	12m 39s
ci (ubuntu-22.04, 8, 2.13.15, 2.4, 7.0) / Standard Library (2.13.15)	2m 2s
ci (ubuntu-22.04, 8, 2.13.15, 2.4, 7.0) / Build Mdoc & Website	6m 16s
ci (ubuntu-22.04, 8, 2.13.15, 2.4, 7.0) / Test Scala-CLI Example / Build and Test	2m 35s
check tests	1s
all tests passed	1s
publish	0s
Deploy Website	0s
	52m 32s

Provide feedback