Visit here https://tex-image-link-generator.herokuapp.com/
Now, you can use equations in github readme (this readme), github issues (like this) and other services.
https://gist.github.com/a-rodin/fef3f543412d6e1ec5b6cf55bf197d7b
masakiaota/tex_image_link_generator
generate <img src="https://render.githubusercontent.com/render/math?math={tex}">
PythonMIT