docs: switch to gopher favicon

The favicon on restic.readthedocs.io still contained the old
superman-style logo.

This changes it to the 32x32 gopher icon also used on https://forum.restic.net/ ,
just converted to .ico using Gimp.

Tested by building the documentation and opening index.html in Chrome.
The new favicon looks fine.
This commit is contained in:
Jakob Unterwurzacher 2019-07-13 19:14:20 +02:00 committed by Leo R. Lundgren
parent d8da9c4401
commit 5ae7e6f945

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