[Feature] Have graph actually reflect exercises

[Taks07]

Please ensure the following for feature requests

• [x] I checked to ensure there aren't other open Pull Requests for the same update/change.

Is your feature request related to a problem? Please describe.

The graph right now is randomly generated. Depends on #55

Describe the solution you'd like

The graph should connect to the backend to get the history of exercises, then display this.

Include a user story to describe why you want this feature

As a user, I want to be able to view my actual exercise progress in a graph, so that I can easily track my workout progress

[vonner04]

Are the endpoints setup for this or not yet?

[Taks07]

I think so? I believe its just fetching the workouts history, then passing that into the graph. Might need to calculate the score for each workout in between though

[vonner04]

Remove muscle group filter and just track the scores from workouts table.

Can reason this change via refactor of the back-end. Lost of workout information granularity?