docs: update block details docs for route restructure Rename the block details route to /reporting-units/$ruId/$blockId, document the new ReportingUnitBlocksList section on the reporting unit details page, and trim the standalone block details page doc to match the restructured implementation (decision D8).
docs: add reporting unit block details page docs Documents ReportingUnitBlockDetailsPage, BlockDetailsSummary, BlockDetailsSkeleton, useDelayedFlag, and useReportingUnitDetailsQuery; updates routing, architecture overview, and frontend testing pages (issue #1369, slices 1/2/4/5).
feat: Add human-facing indexes for various components, services, and documentation across the project