Fonts used on shipatmidnight.dev, served from this site:

Epilogue — Copyright 2020 The Epilogue Project Authors (https://github.com/Etcetera-Type-Co/Epilogue).
JetBrains Mono — Copyright 2020 The JetBrains Mono Project Authors (https://github.com/JetBrains/JetBrainsMono).

Both are licensed under the SIL Open Font License, Version 1.1. The full licence text is in /fonts/Epilogue-OFL.txt
and at https://openfontlicense.org.