The special sha is no longer needed, let's bump to a recent version of
hugo instead and that should make it all work nicely (for a while).
Updating hugo requires changing to hugo.toml and forcing mermaid to be
enabled, without those changes the build failed with
`failed to extract shortcode: template for shortcode "mermaid" not found`
This reverts commit 5909717700
Part-of: <https://gitlab.freedesktop.org/libinput/libei/-/merge_requests/358>