update archetypes/default.md

used when create new (empty) files with
 hugo new content/post/.../index.md

archetypes/default.md

@@ -1,9 +1,8 @@
 +++
-# vim: ft=markdown
 title = '{{ replace .Name "-" " " | title }}'
-summary = ''
+summary = ''''''
 date = '{{ .Date }}'
-lastmod = '2023-07-30T09:10:47+0000'
+#lastmod = ''
 categories = [ 'amateur-radio', 'computerstuff' ]
 tags = []