docs: fix canonical link for www.roundup-tracker.org index page the index page canonical link was: https://www...org/index.html change the template so the canonical is set to https://www...org/ as that is how it's listed by crawlers.

#!/usr/bin/env python
from __future__ import print_function
import zlib, base64, sys
print(base64.encodestring(zlib.compress(sys.stdin.read())))