fix(templates): Pages geometry accounts for subgroup nesting

Andrew Dunnrequested to merge
fix/pages-subgroup-geometry into main

What

The docs starter's astro.config.mjs bakes in https://<GROUP>.gitlab.io + base: /<PROJECT_NAME> — wrong for any project nested in a subgroup. GitLab Pages serves at the ROOT namespace's domain with the full remainder as the path: group/subgroup/project serves at https://group.gitlab.io/subgroup/project/.

How it surfaced

public-sector/egress (stamped from this template before the scaffold-script retirement) shipped with base: '/egress' and the malformed site URL https://gitlab-com/public-sector.gitlab.io. Every subpage 404d on Pages. Fixed instance-side in egress; this MR fixes the source so the next adaptation cannot repeat it.

Fix

Two documented placeholders replace the old pair wherever Pages URLs appear in the lab and docs starters:

  • <PAGES_ROOT_NAMESPACE> — first segment of the group path (the Pages domain).
  • <PAGES_BASE_PATH> — subgroup nesting plus project slug, leading slash (/public-sector/egress; /<project> for an un-nested group).

Both README-template placeholder tables document the derivation for adapters following the SSOT map. scripts/validate-templates.sh and just check pass (18 standards).

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