Updes

- [X] Faster linear solves with `Lineax`
- [X] Support for both `vals` and `coeffs` as fields inputs to differential and rhs operators
- [X] Fixed the `args` inputs to construct the local matrix for the `nodal_div_grad`: (if array, else, etc.)
- [X] Added colorbar to animate fields
- [X] Implemented the Darcy flow problem in demos

This release includes:
- A patch to fix the problem that occurred due to non-staking of the field arguments when passed to the differentiable operators
- Separate readmes for PyPI and GitHub
- Nicer documentation with 3 pages and a longer tutorial

Finally, Updes is available in its first official release. This release comes with:
- A way to simulate and control PDEs with ease
- A documentation with QuartoDoc
- Detailed readme and reference paper
- Further example PDEs in the demos
- Etc.

We are officially accepting issues and pull-requests 🎉

Major pre-release before first official release !

Miles stone reached.
Periodic boundary conditions !

This release focuses on demos for the Navier-Stokes test case:
- Derivation of various schemes for the NS equations
- Training PINNs and collecting performance metrics
- Benchmarking CPU times and peak memory usage
- Etc.