[Proposal] Publish on PyPI

[dest1n1s]

We can publish this library on PyPI so that people can use this package simply using pip install lm-saes! However, before this we should first get this library well-tested and well-documented:

• [Proposal] Add Automatic (Unit) Testing and CI Workflows #16
• [Proposal] Documentation coverage and static documentation site #17

Besides, even if we publish this library, people may still need to clone this repository for using the visualization tools. Perhaps we can publish docker images of the backend & frontend of visualization.