Remove unused UI components

[MattFerraro]

The "mattferraro.dev" in the upper right corner is a placeholder that will one day hold the user's own username. For now it is unused and should be removed.

The "Solve" and "Step" buttons are a holdover from a previous experiment building an iterative 2D constraint solver. They are no longer necessary and should be removed.

[bhiwagade-rahul]

@MattFerraro I have not found "Solve" and "Step" buttons, can you please explain where it is?

[av8ta]

@MattFerraro I have not found "Solve" and "Step" buttons, can you please explain where it is?

if you search for "solve" you will find it.

I already put this PR through. If you were wanting to add more to it, it would have been better as a draft, or just wait until you have it done before raising the PR. All good if PRs are small changes like this one though 👍