Wire up react-router with a root layout route and an index home page,
following the single-arborescence conventions: pages live under pages/,
routes are built from AppRoute via routeFromAppRoute, and route bundles
load lazily behind a Suspense fallback.
Add the @probo/routes and @probo/react-lazy workspace dependencies that
the route setup relies on.
Signed-off-by: Émile Ré <emile@probo.com>
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