Category icons: MIT-Licensed Icons via https://hvif-store.art/

Each icon below is used under the MIT license, which asks that the
origin be acknowledged. The files are unmodified; the mapping to our
categories is ours.

games.svg                    "Joystick" by Arti (MIT) -- https://hvif-store.art/ (icon #1289)
systemandutilities.svg       "Settings" by zuMi (MIT) -- https://hvif-store.art/ (icon #1207)
development.svg              "Terminal" by zuMi (MIT) -- https://hvif-store.art/ (icon #991)
productivity.svg             "Calendar" by zuMi (MIT) -- https://hvif-store.art/ (icon #861)
internetandnetwork.svg       "Network" by Haiku, Inc. (MIT) -- https://hvif-store.art/ (icon #425)
graphics.svg                 "Palette" by zuMi (MIT) -- https://hvif-store.art/ (icon #1005)
education.svg                "Book" by Haiku, Inc. (MIT) -- https://hvif-store.art/ (icon #295)
video.svg                    "Movie Library" by zuMi (MIT) -- https://hvif-store.art/ (icon #1206)
scienceandmathematics.svg    "Labs" by zuMi (MIT) -- https://hvif-store.art/ (icon #973)
utilities.svg                "Toolbox" by humdinger (MIT) -- https://hvif-store.art/ (icon #1213)
network.svg                  "Ethernet" by zuMi (MIT) -- https://hvif-store.art/ (icon #781)
business.svg                 "Piggy Bank" by Arti (MIT) -- https://hvif-store.art/ (icon #1294)