Streamlit app for dashboarding results, updated packages, and clean up

[deanp70]

Changes in this PR:

1. Update gitignore
2. Removed unnecessary files
3. Updated requirements
4. Updated README to include instructions on streamlit app running
5. Changed output CSV destination to be inside gitignored outputs/ folder for convenience
6. Added streamlit app that supports:
   1. Uploading a CSV if it's already been downloaded
   2. Running GHRR on a provided repo URL
   3. Showing 4 charts (easy to add more)
   4. Showing the table in a filterable and searchable interface