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/titulaire.py

@@ -43,8 +43,8 @@ def get_title(titulaire_id: str = None) -> str:
         "titulaire_nom"
     )
     if titulaire_nom.height > 0:
-        return f"Marchés publics remportés par {titulaire_nom.item(0, 0)} | decp.info"
-    return "Marchés publics remportés | decp.info"
+        return f"Marchés publics remportés par {titulaire_nom.item(0, 0)} | colibre"
+    return "Marchés publics remportés | colibre"
 
 
 register_page(