diff --git a/website/static/img/z2.png b/website/static/img/z2.png deleted file mode 100644 index 811d34cf3..000000000 Binary files a/website/static/img/z2.png and /dev/null differ diff --git a/website/static/img/z4.png b/website/static/img/z4.png deleted file mode 100644 index f86ce293d..000000000 Binary files a/website/static/img/z4.png and /dev/null differ