[Doc]: Self-Hosting #69
Description
Describe the feature you want to add
We should add a section to README.md that describes, step by step, how to self-host MyButton on either GitHub Pages or any other server. For this purpose, we may need to refactor some parts of the codes to make them more modular, for example: the base URL for images.
Describe your proposed solution
No response
Describe alternatives you've considered, if relevant
No response
Additional context
No response