Scrapes the web for uscf chess ratings, lichess ratings, and chesskid ratings given a sheet with names and IDs.

• Make copy of vars-default to vars
• Modify vars to update the value for gsheets_api_key_file
• Modify 'rss_url' to allow traversal through a chesskid rss
• 'source_sheet' should have a list of 4 columns, for full names, uscf ids, lichess usernames, and chesskid usernames
• 'target_sheet' can be empty outside of the header
• setup a venv by the name of .venv using requirements.txt
• 0 5-23/3 * * * /usr/bin/bash PATH/TO/run_ws.sh to run every 3 hours from 5 am to 11 pm (UTC or whatever system time is).