This is the homeserver written in Rust, right?
A suggestion: wherever a QR code is included, the human-readable content should be included next to it. Not everyone has a QR code reader handy, or their reader has the bad habit of immediately opening links or apps. In this case, I see that it just goes to https://continuwuity.org/ and is benign, but others may be apprehensive at naked QR codes.
(there's obviously an exception for QR codes that are intended to convey machine info, like TOTP codes)