Restructure repository to separate scraper and post-processing code

[ramonechen]

For the sake of making the project simpler to understand for users, I've been thinking of restructuring the project folder hierarchy so that there's a clear separation between scraper and postprocessing code. Right now, it's all mashed together in one flat hierarchy and to an outside user, it might not be immediately clear which scripts are relevant to just the scraping part.

One idea of a new folder structure looks something like this:

src
|__scraper
     |__scraping logic
|__postprocessing
     |__post processing logic