Reorganise scripts to be packaged and published on PyPI

[faheel]

Have a single runner script that uses functionality from fetch_repos.py and generate_markdown.py based on the argument (fetch / save) passed to it.

Usage examples:

<package_name> fetch faheel
# same as ./fetch_repos.py faheel

<package_name> save faheel
# same as ./generate_markdown.py faheel

<package_name> save faheel --format=table
# same as ./generate_markdown.py faheel -o table