Grabbed dndbeyond's source code

```
~/go/bin/sourcemapper -output ddb -jsurl https://media.dndbeyond.com/character-app/static/js/main.90aa78c5.js
```

ddb_main/tools/js/Shared/utils/navigationUtils.ts

@@ -0,0 +1,8 @@
+import {
+  CampaignDataContract,
+  CampaignUtils,
+} from "@dndbeyond/character-rules-engine/es";
+
+export function getLaunchGameUrl(campaign: CampaignDataContract): string {
+  return `/games/${CampaignUtils.getId(campaign)}`;
+}