resources/page: Allow section and taxonomy pages to have a permalink configuration

Allows using permalink configuration for sections (branch bundles) and
also for taxonomy pages. Extends the current permalink configuration to
be able to specified per page kind while also staying backward compatible:
all permalink patterns not dedicated to a certain kind, get automatically
added for both normal pages and term pages.

Fixes #8523

resources/page/page_generate/generate_page_wrappers.go

@@ -221,7 +221,7 @@ func generateFileIsZeroWrappers(c *codegen.Inspector) error {
 	methods := c.MethodsFromTypes([]reflect.Type{reflect.TypeOf((*source.File)(nil)).Elem()}, nil)
 
 	for _, m := range methods {
-		if m.Name == "IsZero" {
+		if m.Name == "IsZero" || m.Name == "Classifier" {
 			continue
 		}
 		fmt.Fprint(&buff, m.DeclarationNamed("zeroFile"))
@@ -255,6 +255,11 @@ func (zeroFile) IsZero() bool {
 	return true
 }
 
+func (z zeroFile) Classifier() files.ContentClass {
+	z.log.Warnln(".File.Classifier on zero object. Wrap it in if or with: {{ with .File }}{{ .Classifier }}{{ end }}")
+	return files.ContentClassZero
+}
+
 %s
 
 `, header, importsString(pkgImports), buff.String())