➕ Add definitions for Hispanic, Latino and Latinx (#89)

* Add definitions for Hispanic, Latino and Latinx

* Update hispanic, latino and latinx definitions to indicate their pan-ethnic connotations.

11ty/definitions/american.md

@@ -9,6 +9,10 @@ sub_terms:
     full_title: Asian American
   - text: Black
     full_title: Black American
+  - text: Hispanic
+    full_title: Hispanic American
   - text: Indigenous
     full_title: Indigenous American
+  - text: Latin
+    full_title: Latin American
 ---