chore: improve documentation config

Author: cyrildewit

docs/_config.yml

@@ -1 +1,8 @@
 remote_theme: pmarsceill/just-the-docs
+
+enable_copy_code_button: true
+last_edit_timestamp: true
+gh_edit_link: true
+gh_edit_repository: "https://github.com/fhict-skilltree/backend-application"
+gh_edit_branch: "main"
+gh_edit_view_mode: "tree"