Rebuild site metadata (will move these updates into CI, but not yet)

Author: pimterry

public/images/next-image-export-optimizer-hashes.json

@@ -91,6 +91,7 @@
     "header-images/notepad.jpg": "2bs+CkGbaYthUl2ePFX8l2On7zMrYOTnoRlnVl2Lypo=",
     "header-images/old-records.jpg": "1d7TbncMPhipLSH-zfYKzPB2HkaaUAJG-bwoZBydM6Q=",
     "header-images/open-padlock-keys.jpg": "368c4xFjwjLknLuDcMOSJyZU3SBvX4t+J8lmCnUpBVk=",
+    "header-images/open-source-pledge.png": "VJ8c1rwK3W+88hixNDdMlUSp4KZ2Ebj+oxsYeBB+eJ8=",
     "header-images/open.jpg": "z-lYQd5lhRvP0UQWomC2mwJAg1X+nmpnlgXgLKFZ4ac=",
     "header-images/people-network-graph.jpg": "U0en-m16EWMqq8uD7KgjIDEgRnDOmtG4WHhTSBvVISU=",
     "header-images/person-behind-mirror.jpg": "YB2qSK+55lyR6D8thMddKashn23F4VPlljuzIdEcDyE=",