Publish site manifest from actual website (cf local/partial builds)

[djencks]

If we publish the site manifest used in partial builds on the main website, one main problem with doing a quick local xref-check build is removed, namely the need to do a full local build at least once first.

This will require some changes to the local-build.sh scripts, including another "goal".

[djencks]

I've put the logic in the local-builds script in camel-website, so we can change it once in one place. Each subproject script will call this one with the minimal information.

Docs:
apache/camel#6595

Related PRs for camel:
apache/camel#6600
apache/camel#6601
apache/camel#6602
apache/camel#6603
apache/camel#6604
apache/camel#6605

Related PRs for camel-karaf:
apache/camel-karaf#97
apache/camel-karaf#98
apache/camel-karaf#99
apache/camel-karaf#100
apache/camel-karaf#101
apache/camel-karaf#102

Related PRs for camel-spring-boot:
apache/camel-spring-boot#422
apache/camel-spring-boot#423
apache/camel-spring-boot#424
apache/camel-spring-boot#425
apache/camel-spring-boot#426
apache/camel-spring-boot#427

Related PRs for camel-k:
apache/camel-k#2839
apache/camel-k#2840
apache/camel-k#2841
apache/camel-k#2842

Related PRs for camel-kafka-connector:
apache/camel-kafka-connector#1305
apache/camel-kafka-connector#1306

Related PRs for camel-kamelets:
apache/camel-kamelets#661
apache/camel-kamelets#662
apache/camel-kamelets#663

Related PRs for camel-quarkus:
apache/camel-quarkus#3422
apache/camel-quarkus#3423
apache/camel-quarkus#3424
apache/camel-quarkus#3425

In order to avoid losing some, I'd like to apply all of these at once.

[djencks]

Let's leave this open until all the subsidiary PRs are merged.

[djencks]

I think this is complete.