Re-create analysis for S Lawndale

[rahulgoel97]

1. Pull data for S Lawndale for summer and fall (PurpleAir #113494, #113474, #5774)
2. Compare to existing AirNow data

[rahulgoel97]

Updates:

• Added info to pa_sensors.json for 3 S Lawndale files
• Nomenclature issues on "sensor name" - not all sensors have a location of a cross street - rename json header?
• Approved PR since there were additions and no deletions.

Issues faced:

• ValueError: Expected object or value on 1.1-purpleair-data-extraction while trying to read in using sensor_df = pd.read_json("data/pa_sensors.json")
• ImportError: cannot import name 'PURPLE_AIR_KEY' from 'src.config' (/Users/rahulgoel/Air-Quality/src/config.py) - assuming I need to set this up locally by editing the .file?