[Docs] Self-contained way of generating components/dataformats/etc tables

[djencks]

The existing way of generating the components etc tables based on page attributes in main camel has always been too complicated and it turns out that it was based on some erroneous assumptions about the relationship between camel-quarkus and camel versions.

The extensions used have advanced enough so that the tables can be generated entirely within camel-quarkus.

• Instead of generating partial snippets with the relevant information as page attributes, generate example yml files.
• Use indexer on the example yml files with json "contentAs" to make the data available to the table construction.

We can also remove the header include in main camel components docs.

[djencks]

This requires apache/camel-website#728.

[djencks]

The PRs implementing this are (along with camel-website #728)

#3397
#3398
#3399
#3400

and some cleanup in main camel

apache/camel#6561
apache/camel#6562
apache/camel#6563
apache/camel#6564
apache/camel#6565
apache/camel#6566

and some fixes in apache/camel#6578

[djencks]

This is now done.