Merge pull request #7992 from apollographql/docs/add-solutions-links

docs: add solutions repo links

Author: Meschreiber

docs/source/integrations/mern.mdx

@@ -251,4 +251,6 @@ Congrats on completing the tutorial! 🎉 Incorporating a GraphQL server into yo
 
 While this tutorial only covers the server portion of the MERN stack, the `/client` folder in the [completed example](#complete-example) picks up where the tutorial left off and implements [`@apollo/client`](/react/) to interact with the server. For more information on implementing the Apollo Client, head to the [getting started docs](/react/get-started).
 
-For more hands-on learning on GraphQL and Apollo's server and client libraries, check out our interactive [Odyssey tutorials](https://www.apollographql.com/tutorials/).
+For more hands-on learning on GraphQL and Apollo's server and client libraries, check out our interactive [Odyssey tutorials](https://www.apollographql.com/tutorials/). For an example that uses MongoDB Atlas in a subgraph and makes data available via the GraphOS Router, check out the [Apollo Solutions repository](https://github.com/apollosolutions/example-subgraph-mongodb).
+
+<SolutionsNote />

docs/source/performance/apq.md docs/source/performance/apq.mdx

@@ -234,3 +234,10 @@ const server = new ApolloServer({
   persistedQueries: false, // highlight-line
 });
 ```
+
+## Additional resources
+
+This [Apollo Solutions repository](https://github.com/apollosolutions/apq-hasher) provides a simple web app for generating the hash of a query that is used in APQ requests.
+This demonstrates how Apollo Client formats and hashes queries.
+
+<SolutionsNote />