chore: remove laboratory blueprint and legal section from site

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

site/blueprints/pages/laboratory.yml

@@ -1,6 +0,0 @@
-title: Laboratoire
-
-tabs:
-  contentTab:
-    label: Contenu
-  seo: seo/page

site/blueprints/site.yml

@@ -5,14 +5,4 @@ tabs:
     label: Contenu
     sections:
       investigations: fields/investigations
-      legal:
-        type: pages
-        label: Pages légales
-        templates:
-          - legal-notices
-          - privacy-policy
-          - newsletter
-        layout: list
-        text: "{{ page.title }}"
-        create: false
   seo: seo/site