Add an HTTP server for development purposes that replies to requests
with both the static resources and on the fly generated pages. This
serves the following needs.
- Modern module scripts requires an origin supporting CORS policies,
which is not supported when pages are read from disk by the browser.
- Provide a way for implemting automatic reloading of pages when changes
are made to the source files.
- Act as the starting point for making interactive features such as
comments and analytics.
Provide a transformation function that maps absolute references to
resources into relative references based on the location of a page.
This makes it possible to use the same links across multiple pages
in the hierarchy that works when loaded as files from the filesystem.
