Change camel-website checkout directory path
Change camel-website checkout directory path

Makes the checkout directory for the camel-website.git:asf-site branch
be `/www/camel.apache.org/content/staging` as the current site has a
`/content` which is matched by rewrite rules. As suggested by Daniel
Gruno[1]

[1] https://issues.apache.org/jira/browse/INFRA-15969?focusedCommentId=16668569#comment-16668569

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