Change the asset handling to the following requirements:
- 2 Kinds of static assets
  - Compiled into the binary (for example, images, css, js) called "static"
  - Served from a defined folder (for example, user uploaded files) called "assets"
- statics are compiled into the binary and are served from a single handler
- Assets are served from a defined folder are served from a different handler
- The static handler uses a table to store all the static files
- The assets handler serves files from a defined folder on the filesystem

Additional requirements:
- make the htmx lib a static asset
- add a www folder for the assets
- add a demo asset file to the www folder