Some godoc adjustments and image struct renames

resources/page/weighted.go

@@ -63,7 +63,7 @@ func (w WeightedPage) String() string {
 	return fmt.Sprintf("WeightedPage(%d,%q)", w.Weight, w.Page.Title())
 }
 
-// Slice is not meant to be used externally. It's a bridge function
+// Slice is for internal use.
 // for the template functions. See collections.Slice.
 func (p WeightedPage) Slice(in any) (any, error) {
 	switch items := in.(type) {