fix: default archetype date, to prevent vale error in CI (#643)

## Describe your PR

Vale is not working anymore in CI. This PR fixes the default archetype
to avoid the error

Co-authored-by: Clément Nivolle <cnivolle@gmail.com>

Author: davlgd

archetypes/default.md

@@ -1,7 +1,7 @@
 ---
 title: '{{ replace .File.ContentBaseName "-" " " | title }}'
 description:
-date: {{ .Date }}
+date: '{{ .Date }}'
 draft: true
 type: docs
 ---