The site root for https://severinvisionary.github.io/ — an index of the
certified-mathematics deposits, plus the two files that only work at the root of
a github.io host:
robots.txt— a project site's/<repo>/robots.txtis not read by crawlers; only the host-root one is.sitemap.xml— a sitemap index pointing atsitemap-home.xmland the sitemap of every project landing page.
Add a new project here when it gets a landing page: one <sitemap> entry and
one card in index.html.