generate_site.py --engine starlight writes the pages, navigation and
data files of an Astro Starlight project in website/. Links resolve to
site addresses, every heading keeps its MkDocs id, and pages split by
size are measured in the MkDocs Markdown so both builds cut the same
files. The 839 pages and their 45,613 ids match the MkDocs build.
Callouts, collapsible blocks, tabs, buttons, card grids and search
exclusion go through one module that writes the engine's syntax. The
MkDocs output is unchanged apart from whitespace-only lines.
Abdessamad Derraz