Add [`aider`](https://aider.chat/), an AI pair programmer available in the terminal. To simplify the installation, `uv` has been added so it can be used instead of `pipx`. In addition, the `usage` utility is now installed using the `ubi` registry. Reviewed-on: #166 Co-authored-by: Joao P Dubas <joao.dubas+gitea@gmail.com> Co-committed-by: Joao P Dubas <joao.dubas+gitea@gmail.com>