Parse details in rider sidebar

As identified in #17 , due to a recent change to the website layout, the [old code](https://github.com/baronet2/FirstCyclingAPI/blob/a37510aa781d3e6013713bc0c1727bffa2237b86/first_cycling_api/rider/endpoints.py#L40) to parse the sidebar information on rider pages no longer works. It would be nice to bring back this functionality.