Remove Boilerplate Use-case thingy

domain/src/validation/NoteValidations.kt

@@ -1,6 +1,6 @@
 package be.simplenotes.domain.validation
 
-import be.simplenotes.domain.usecases.markdown.ValidationError
+import be.simplenotes.domain.MarkdownParsingError
 import be.simplenotes.types.NoteMetadata
 import io.konform.validation.Validation
 import io.konform.validation.jsonschema.maxItems
@@ -27,9 +27,9 @@ internal object NoteValidations {
         }
     }
 
-    fun validateMetadata(meta: NoteMetadata): ValidationError? {
+    fun validateMetadata(meta: NoteMetadata): MarkdownParsingError.ValidationError? {
         val errors = metaValidator.validate(meta).errors
         return if (errors.isEmpty()) null
-        else return ValidationError(errors)
+        else return MarkdownParsingError.ValidationError(errors)
     }
 }