Add linting and docs badges and update alt texts

Author: matt-graham

README.md

@@ -1,8 +1,10 @@
-[![image](https://github.com/astro-informatics/s2fft/actions/workflows/tests.yml/badge.svg?branch=main)](https://github.com/astro-informatics/s2fft/actions/workflows/tests.yml)
-[![image](https://codecov.io/gh/astro-informatics/s2fft/branch/main/graph/badge.svg?token=7QYAFAAWLE)](https://codecov.io/gh/astro-informatics/s2fft)
-[![image](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
-[![image](https://badge.fury.io/py/s2fft.svg)](https://badge.fury.io/py/s2fft)
-[![image](http://img.shields.io/badge/arXiv-2311.14670-orange.svg?style=flat)](https://arxiv.org/abs/2311.14670)<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
+[![Tests status](https://github.com/astro-informatics/s2fft/actions/workflows/tests.yml/badge.svg?branch=main)](https://github.com/astro-informatics/s2fft/actions/workflows/tests.yml)
+[![Linting status](https://github.com/astro-informatics/s2fft/actions/workflows/linting.yml/badge.svg?branch=main)](https://github.com/astro-informatics/s2fft/actions/workflows/linting.yml)
+[![Documentation status](https://github.com/astro-informatics/s2fft/actions/workflows/docs.yml/badge.svg?branch=main)](https://github.com/astro-informatics/s2fft/actions/workflows/docs.yml)
+[![Codecov](https://codecov.io/gh/astro-informatics/s2fft/branch/main/graph/badge.svg?token=7QYAFAAWLE)](https://codecov.io/gh/astro-informatics/s2fft)
+[![MIT License](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+[![PyPI package](https://badge.fury.io/py/s2fft.svg)](https://badge.fury.io/py/s2fft)
+[![arXiv](http://img.shields.io/badge/arXiv-2311.14670-orange.svg?style=flat)](https://arxiv.org/abs/2311.14670)<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
 [![All Contributors](https://img.shields.io/badge/all_contributors-11-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END --> 
 [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/astro-informatics/s2fft/blob/main/notebooks/spherical_harmonic_transform.ipynb)