docs: Add docs on the new front matter configuration
docs: Add docs on the new front matter configuration

See #4495

mdhender/hugo,mdhender/hugo,gohugoio/hugo,anthonyfok/hugo,anthonyfok/hugo,fedelibre/hugo,anthonyfok/hugo,fedelibre/hugo,fedelibre/hugo,mdhender/hugo,mdhender/hugo,fedelibre/hugo,gohugoio/hugo,gohugoio/hugo