refactor: rebrand decp.info to colibre #57

- Rename project from decp.info to colibre across all codebase
- Update domain from https://decp.info to https://colibre.fr
- Update GitHub repo references to ColinMaudry/colibre
- Rename deployment files: decpinfo-backup.* → colibre-backup.*
- Update project configuration and documentation
- Rename project assets: decp.info.png → colibre.png
- Update environment variables and constants (DOMAIN_NAME, TOKEN_PREFIX, GITHUB_REPO, etc.)
- Update URLs in all pages, tests, and configuration files
- Keep DECP acronym in text (unchanged per requirements)
- Add rebrand note to README.md

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/pages/tableau.py

@@ -55,7 +55,7 @@ NAME = "Tableau"
 register_page(
     __name__,
     path="/tableau",
-    title="Tableau des marchés publics | decp.info",
+    title="Tableau des marchés publics | colibre",
     name=NAME,
     description="Consultez, filtrez et exportez les données essentielles de la commande publique sous forme de tableau.",
     image_url=META_CONTENT["image_url"],
@@ -149,7 +149,7 @@ layout = [
                     "@type": "Dataset",
                     "name": "Données essentielles des marchés publics français (DECP)",
                     "description": "Données de marchés publics exhaustives décrivant les marchés publics attribués en France depuis 2018.",
-                    "url": "https://decp.info",
+                    "url": "https://colibre.fr",
                     "sameAs": "https://www.data.gouv.fr/datasets/608c055b35eb4e6ee20eb325",
                     "keywords": [
                         "marchés publics",