Move .env file to config dir, change db path for improved project structure

* Change path of db and token to `data` which helps to sperate source
  code from data files like `tokens.json` & `spotify_scraped.db`
* Change path of `.env` `src/env/` to `config/` for the same reason as
  mentioned above
* Added the newly created files to `.gitigore` accordingly

src/scraper.py

@@ -3,7 +3,7 @@ import requests
 from auth import authenticate, simple_authenticate
 from database_handler import Database, Table
 
-db = Database('spotify_scraped.db')
+db = Database('./data/spotify_scraped.db')
 
 
 def scraping():