(with marketplace aliases) Product docs migration, hide tree nav for …

…blog and resources (#7082)

* Product docs migration, hide tree nav for blog and resources

* Move marketplace

* Add aliases for moved marketplace guides

* Add aliases for moved marketplace sections and pages

* Fix blueberry errors

* Fix frontamtter syntax error

* Fix alias typo

* Update marketplace links in guides to new marketplace URLs

* Add authors frontmatter

* Add authors frontmatter

* Fix frontmatter syntax

* Fix frontmatter syntax

* Add contributors frontmatter

* Add license frontmatter

* Add description frontmatter

* Add keywords frontmatter

* Update check-links.py to include marketplace-docs

* Fix links

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Co-authored-by: Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>
Co-authored-by: Matthew Wildman <matt@wildman.online>