v0.4.0

Breaking: markdown URLs are extensionless. /about/ → /about/md/ (front page /md/, /sv/om-oss/md/, /blog/page/2/md/; /about/md on sites without trailing slashes). The index.html.md and .md forms are gone.

Edge caches treat URLs with a file extension as static files; on Kinsta the edge cache skips them whatever the content type, so .md markdown was never edge-cached. Extensionless, it is cached like a page. (#16)

• llms.txt tells readers about the md/ suffix; frontmatter translations and the alternate link use the new URLs.
• A page whose own slug is md is shadowed by its parent's markdown.
• On Kinsta only txt needs excluding from the CDN now (for llms.txt).