Add option for public deployment without authentication (i.e. no cookies)

app.py

@@ -155,6 +155,8 @@ def download_for_browser(url, mode='audio', quality='high'):
         logger.info(f"Using Firefox cookies: {USE_FIREFOX_COOKIES}")
         if USE_FIREFOX_COOKIES == "True":
             opts["cookiefile"] =  "firefox-cookies.txt" #create_temp_cookie_file() 
+        else:
+            opts["no_cookies"] = True # Forces yt-dlp to access YouTube without any authentication
 
         # Download file
         logger.info(f"Downloading {url} with options: {opts}")