Revert "update image (#53)"

This reverts commit b8f0c8d80bdc8df19ee19b701947f02e4097daf6.
diff --git a/static/images/fork-repo.png b/static/images/fork-repo.png
index b9a2148..76426fe 100644
--- a/static/images/fork-repo.png
+++ b/static/images/fork-repo.png
Binary files differ