docs: auto-generate anchors

Checks were failing when referencing anchors from different files

docs/conf.py

@@ -134,7 +134,7 @@
     # NOTE: If set, links for viewing the documentation source files
     #       and creating GitHub issues are added at the bottom of each page.
     "github_url": "https://github.com/ubuntu/authd",
-    # 
+    #
     # Add a feedback button
     'github_issues': 'enabled',
     # Docs branch in the repo; used in links for viewing the source files
@@ -213,6 +213,10 @@
 # myst_enable_extensions = set()
 
 
+# Auto-generate header anchors
+myst_heading_anchors = 3
+
+
 # Custom Sphinx extensions; see
 # https://www.sphinx-doc.org/en/master/usage/extensions/index.html