Caustics

What's Changed
* add caustics Logo by ConnorStoneAstro in https://github.com/Ciela-Institute/caustics/pull/101
* refactor: Setup package structure to follow the Scientific Python Library Development Guide by lsetiawan in https://github.com/Ciela-Institute/caustics/pull/103
* Update Scientific Python link by uwcdc in https://github.com/Ciela-Institute/caustics/pull/108
* test: add tests built in to caustics for quick diagnostic by ConnorStoneAstro in https://github.com/Ciela-Institute/caustics/pull/109
* docs: Update badges to correct links in README by lsetiawan in https://github.com/Ciela-Institute/caustics/pull/107
* feat: Adding gaussian quadrature integrator by ConnorStoneAstro in https://github.com/Ciela-Institute/caustics/pull/111
* docs: Update docs with Jupyter Book and NumPy docstrings by uwcdc in https://github.com/Ciela-Institute/caustics/pull/110
* ci: Add test command for cd by lsetiawan in https://github.com/Ciela-Institute/caustics/pull/113
* test: Adding test for quick test by ConnorStoneAstro in https://github.com/Ciela-Institute/caustics/pull/112

New Contributors
* lsetiawan made their first contribution in https://github.com/Ciela-Institute/caustics/pull/103
* uwcdc made their first contribution in https://github.com/Ciela-Institute/caustics/pull/108

**Full Changelog**: https://github.com/Ciela-Institute/caustics/compare/0.5.0...v0.6.0

Updates to a number of features including:
- multiplane
- object names
- reformat `source` to now be more general `light`
- forward raytrace
- new basic simulator object

Bug fixes to TNFW class. Pixelated Convergence also has more correct FFT convolution.

Bug fix for pixelated convergence FFT padding mode. Caustic now has a website! TNFW online mostly

Added the TNFW lens to caustic

Multiplane lensing now includes Effective convergence including both the divergence and curl components.

Forward raytracing now available.

mass sheet lens added

bug fixes in graph viewer and pixelscale arguments