Fix handling of HTML files without front matter

This means that any HTML file inside /content will be treated as a regular file.

If you want it processes with shortcodes and a layout, add front matter.

The defintion of an HTML file here is:

* File with extension .htm or .html
* With first non-whitespace character "<" that isn't a HTML comment.

This is in line with the documentation.

Fixes #7030
Fixes #7028
See #6789

tpl/template.go

@@ -29,7 +29,6 @@ type TemplateManager interface {
 	TemplateHandler
 	TemplateFuncGetter
 	AddTemplate(name, tpl string) error
-	AddLateTemplate(name, tpl string) error
 	MarkReady() error
 }