Update featured story/footer for new layouts

Merged Ghost User requested to merge github/fork/autumnfound/malowe/master/featured-update into master

Added new post_content field that is inserted between content and link. Added new post_class, content_class, preamble_class, and header_class fields that inject classes on the given fields.

Signed-off-by: Martin Lowe martin.lowe@eclipse-foundation.org

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