v0.15.0

A release about the sidebar and the "Order form constructor" documentation
page: the menu now tells a category from the services inside it, and the page
hands you a ready prompt for the version document.

Added

• Added "Download prompt" and "Copy prompt" buttons to the "Order form
  constructor" documentation page: with that prompt any LLM writes a version
  document from the chart schema.

Changed

• Separated category headers from the services inside them in the sidebar.
  A header now sits on its own background, and the services are indented
  under a faint dashed guide.
• Updated the sidebar and topbar icons in one style. An icon answers to a
  pointer or to keyboard focus with a short movement, and stays still when
  the system asks for reduced motion.
• Team names in the project selector are written in capitals, and the
  selected team is picked out in bold.
• Extended the "Order form constructor" documentation page with a complete
  document example, map-key columns in tabs and the meaning of more error
  messages.