As a user, I want to receive notifications about new releases

Example of [release](https://github.com/codex-team/codex.docs/releases/tag/v0.1.1):

![image](https://user-images.githubusercontent.com/37909603/161735113-388ad477-e757-495e-aed8-1ead1e63ece9.png)