Create separate modules for core APIs, CLI and web client

This project was started with the intention of managing GitHub organization repositories easily. At the early stage only CLI module existed. Initially this was created for hacktoberfest to add labels, remove labels to many issues at once after a selection process. With the rapid development we saw an opportunity for a web client as well.

We should decide on separating core APIs, CLI and the web client.

cc: @charithsoori @rehrumesh