Gumroad is a self-publishing digital marketplace platform to sell digital services such as books, memberships, courses and other digital services.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Vercel is a cloud platform for static frontends and serverless functions.
VuePress is a static site generator with a Vue-powered theming system, and a default theme for writing technical documentation.