frontmatter key for know how outdated a converted HTML document is in es locale

[Graywolf9]

This space is for set a name for a frontmatter key to identified the es files with 2-5 years of outdated content this due to the es-team use the html format to know what are the most outdated content to update

[Graywolf9]

Not nessesary anymore

[pransh15]

Closing this as resolved. ✅