feat: support emitters defining external resources, emit link from contentindex directly

quartz/plugins/transformers/latex.ts

@@ -59,8 +59,6 @@ export const Latex: QuartzTransformerPlugin<Partial<Options>> = (opts) => {
               },
             ],
           }
-        default:
-          return { css: [], js: [] }
       }
     },
   }