[MNG-8473] Site fixes

[cstamas]

Maven4 site cleanup: make all new modules generating models also document them, expose them all and redirect all links to new documentation.

Lifecycle is the only thing missing, as it is generated on the fly, there is no more source to "point at"...

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https://issues.apache.org/jira/browse/MNG-8473

[gnodet]

Why not pointing at:

• maven/impl/maven-core/src/main/java/org/apache/maven/internal/impl/DefaultLifecycleRegistry.java

  Lines 383 to 412 in 751d3f1

  	ALL,
  	phase(VALIDATE, phase(INITIALIZE)),
  	phase(
  	BUILD,
  	after(VALIDATE),
  	phase(SOURCES),
  	phase(RESOURCES),
  	phase(COMPILE, after(SOURCES), dependencies(COMPILE, READY)),
  	phase(READY, after(COMPILE), after(RESOURCES)),
  	phase(PACKAGE, after(READY), dependencies("runtime", PACKAGE))),
  	phase(
  	VERIFY,
  	after(VALIDATE),
  	phase(
  	UNIT_TEST,
  	phase(TEST_SOURCES),
  	phase(TEST_RESOURCES),
  	phase(
  	TEST_COMPILE,
  	after(TEST_SOURCES),
  	after(READY),
  	dependencies("test-only", READY)),
  	phase(
  	TEST,
  	after(TEST_COMPILE),
  	after(TEST_RESOURCES),
  	dependencies("test", READY))),
  	phase(INTEGRATION_TEST)),
  	phase(INSTALL, after(PACKAGE)),
  	phase(DEPLOY, after(PACKAGE))));

• maven/impl/maven-core/src/main/java/org/apache/maven/internal/impl/DefaultLifecycleRegistry.java

  Lines 472 to 476 in 751d3f1

  	phase(PHASE_SITE, plugin(MAVEN_SITE_PLUGIN + "site", PHASE_SITE)),
  	phase(
  	PHASE_SITE_DEPLOY,
  	after(PHASE_SITE),
  	plugin(MAVEN_SITE_PLUGIN + "deploy", PHASE_SITE_DEPLOY)));

• maven/impl/maven-core/src/main/java/org/apache/maven/internal/impl/DefaultLifecycleRegistry.java

  Lines 361 to 365 in 751d3f1

  	return List.of(phase(
  	Phase.CLEAN,
  	plugin(
  	MAVEN_PLUGINS + "maven-clean-plugin:" + MAVEN_CLEAN_PLUGIN_VERSION + ":clean",
  	Phase.CLEAN)));

They are not much readable for non developers, but maybe our target would know enough ?

The changes to the modello generation leads to unneeded processing if not building the site. That was done on purpose to simplify the config ?

[cstamas]

re "unneeded processing": exactly, I don't care if XSD is being built but unused, what I do care about is simple POM.
re "pointing": i agree, why not. Before the class was literally "listing" phases...