redesign progressbars

+ hide some progressbars
+ rewrite telemetry into a class
+ remove obsolete start info logs
+ update contributing.md to include contributing.md
+ send posthog event in a bg thread
+ related side effects

app/lib/artistlib.py

@@ -8,12 +8,12 @@ import requests
 from PIL import Image, UnidentifiedImageError
 from requests.exceptions import ConnectionError as RequestConnectionError
 from requests.exceptions import ReadTimeout
-from tqdm import tqdm
 
 from app import settings
 from app.models import Album, Artist, Track
 from app.store import artists as artist_store
 from app.utils.hashing import create_hash
+from app.utils.progressbar import tqdm
 
 
 CHECK_ARTIST_IMAGES_KEY = ""