fix: accept domain-only URLs like google.com

The is_url() function now accepts any string with a dot and no spaces,
not just URLs with http:// or containing /. This allows /update 2 -link google.com
to properly set the link instead of treating google.com as text.

apps/telegram-bot/commands.py

@@ -71,7 +71,9 @@ def parse_args(
             return False
         if s.startswith("http://") or s.startswith("https://"):
             return True
-        return "." in s and "/" in s
+        if "." in s and " " not in s:
+            return True
+        return False
 
     i = 0
     while i < len(args):