README + Dockerfile fixes, format config.py

.env.example

@@ -9,10 +9,11 @@ TIMEZONE=America/Edmonton
 PUBLIC_UPLOAD_PAGE_ENABLED=true
 
 # Local dedupe cache (SQLite)
-STATE_DB=./data/state.db
+#STATE_DB=./data/state.db
 
-# Base URL for generating absolute invite links (recommended for production)
-# e.g., PUBLIC_BASE_URL=https://photos.example.com
+# Base URL for generating absolute invite links
+# Recommended for production, also sets CORS headers
+# e.g., PUBLIC_BASE_URL=https://upload.example.com
 #PUBLIC_BASE_URL=
 
 LOG_LEVEL=INFO
@@ -27,5 +28,8 @@ CHUNK_SIZE_MB=50
 # create a bot using @BotFather then copy the API key here
 # get your account's ID by messaging https://t.me/userinfobot
 # Leave these blank to disable
+# Example:
+#     TELEGRAM_BOT_API_KEY=1234567890:ABCDefghIjKlmnOPQRsT-UVWXyzABCdefGH
+#     TELEGRAM_BOT_OWNER_ID=12345678
 TELEGRAM_BOT_API_KEY=
 TELEGRAM_BOT_OWNER_ID=