fix: Link to the legacy bids-validator

web/src/App.tsx

@@ -95,6 +95,7 @@ function App() {
         Note: Selecting a dataset only performs validation. Files are never
         uploaded.
       </div>
+      <div>Previous version of the BIDS validator (non-schema) available <a href="https://bids-standard.github.io/bids-validator/legacy">here.</a></div>
     </>
   )
 }