Notification or Announcements of new features, asset listings, governance proposals

[foodaka]

Background: We currently dont have a good way to indicate to the user in the application new asset listings, announcements, new governance proposals, changelog etc. One nice feature would be to have a bell icon which shows the latest updates across the Aave ecosystem.

• [x] I have searched the issues of this repository and believe that this is not a duplicate.

Summary 💡

When a user is inside the Aave app, we can add a bell icon which when clicked shows a history of the latest changes in the app. From governance proposals, new features, new listings etc.

Examples 🌈

Motivation 🔦

Stakedao has a nice way to indicate updates to the user

[sakulstra]

As a first step it would be great if we had a changelog in the repository :thinking: Then the ui could just embed this somehow.