[docs] Fix edit links and add more metadata

Reported by:	@pedrolab

mkdocs.yml

@@ -18,8 +18,15 @@
 #
 # SPDX-License-Identifier: AGPL-3.0-or-later
 site_name: DD Documentation
+site_url: https://dd.digitalitzacio-democratica.xnet-x.net/docs/
+site_description: |
+  DD is the education workspace generated within the framework of Xnet's Democratic Digitalisation Plan.
+copyright: |
+  DD is the education workspace generated within the framework of <a href="https://dd.digitalitzacio-democratica.xnet-x.net/">Xnet's Democratic Digitalisation Plan</a>
 site_dir: docs.built
+repo_name: Codi
 repo_url: https://gitlab.com/DD-workspace/DD
+edit_uri: edit/main/docs/
 
 theme:
   name: material