re-orgainzied code a little, using go templates instead format string

kleingebaeck.pod

@@ -38,9 +38,10 @@ Format is simple:
 
 Be carefull if you want to change the template. The default one looks like this:
 
-   Title: %s\nPrice: %s\nId: %s\nCategory: %s\nCondition: %s\nCreated: %s\nBody:\n\n%s\n
+   Title: {{.Title}}\nPrice: {{.Price}}\nId: {{.Id}}\nCategory: {{.Category}}\nCondition: {{.Condition}}\nCreated: {{.Created}}\n\n{{.Text}}\n
 
-If you change it, include 7 times the '%s' format tag.
+You can left out certain fields and use any formatting you like. Refer
+to L<https://pkg.go.dev/text/template> for details how to write a template.
 
 =head1 SETUP