docs: images: re-add github image

This got removed with the addition of the new website, but it is used by the
manual so it no longer builds.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

diff --git a/docs/website/images/github_hash_mongrel2.png b/docs/website/images/github_hash_mongrel2.png
new file mode 100644 (file)
index 0000000..c695c31
Binary files /dev/null and b/docs/website/images/github_hash_mongrel2.png differ