The body text is set in Vollkorn by Friedrich Althausen. The headlines are set in Space Grotesk by Florian Karsten. Monospaced text in code samples is set in IBMibm Plex Mono. All of these are published under the SILsil open fonts license.
Italic small capitals have been faked for Vollkorn by using oblique small capitals of a heavier weight.
The header icons are adapted from icons8. All other used images are my own work unless a specific source is given.