DOIs for my websites

Some quick housekeeping: several of my websites now have a Zenodo DOI, so they are easier to cite. This currently covers fanography.info, grassmannian.info, hyperkaehler.info and mgnbar.info, with more to follow. Each site's "how to cite" section now lists the DOI, and I use the version-independent one, so it always resolves to the latest release. If you use any of these in your work, please do cite them: it helps me explain to the people who fund my work that building these things is useful.