docs: make Antora errors stop the build; fix most warnings (#41) #65

Job	Run time
Build and publish artifacts and plugins locally	2m 32s
Basic checks	52s
Check service docker image contents	54s
Run sbt test	3m 48s
Run annotation processor tests	1m 38s
Maven samples (shopping-cart-quickstart, true)	58s
Maven samples (choreography-saga-quickstart, true)	52s
Maven samples (doc-snippets, false)	27s
Maven samples (view-store, true)	1m 15s
Maven samples (spring-dependency-injection, true)	47s
Maven samples (event-sourced-customer-registry, true)	1m 6s
Maven samples (event-sourced-counter-brokers, docker compose up -d, true)	1m 28s
Maven samples (event-sourced-customer-registry-subscriber, true, ./start-upstream.sh)	1m 22s
Maven samples (key-value-counter, true)	59s
Maven samples (key-value-shopping-cart, true)	44s
Maven samples (key-value-customer-registry, true)	56s
Maven samples (tracing, false)	39s
Maven samples (reliable-timers, true)	44s
Maven samples (transfer-workflow, true)	1m 5s
Maven samples (transfer-workflow-compensation, true)	55s
	24m 1s

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