fix(docs): correct repository URL to spec-driven organization

Update mkdocs.yml to reference the correct GitHub repository URL
from morais90/quadro to spec-driven/quadro, matching the actual
repository organization.

Author: morais90

mkdocs.yml

@@ -1,8 +1,8 @@
 site_name: Quadro
 site_description: Your task board in markdown
 site_author: Quadro Contributors
-repo_url: https://github.com/morais90/quadro
-repo_name: morais90/quadro
+repo_url: https://github.com/spec-driven/quadro
+repo_name: spec-driven/quadro
 
 theme:
   name: material