Issue 0107: Update for spyro Compatibility with Latest Firedrake Installation

[Olender]

Description:

This minor update ensures that spyro is compatible with the latest Firedrake installation. The main changes include:

1. Function to Cofunction Conversion: Updated several functions to cofunctions where necessary.
2. Cleanup: Removed old, unused test and HTML files that were unnecessarily taking up space in the repository.

[Olender]

I have also updated the runner file to the correct location of the newest Firedrake installation

[SouzaEM]

The cell type of some tests was changed from "Q" to "T". Is this a limitation of the newer Firedrake version?

[Olender]

Not anymore, the newer version of Firedrake now supports both triangles and quadrilaterals. Initially, I switched to using triangles during testing, as Firedrake had some issues with quadrilaterals at the time. Once these problems were resolved, I chose to continue using triangles since they are our usual preference. However, we still have numerous tests based on quadrilaterals.