docs: exclude docs/README.md from mkdocs build

docs/README.md is a folder placeholder for GitHub's directory listing.
mkdocs treats it as a second index page for docs/ and drops it with a
warning, which aborts `mkdocs build --strict`. Exclude it explicitly via
exclude_docs so strict builds pass cleanly while the file stays in the
repository for GitHub's folder view.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 2 people

mkdocs.yml

@@ -8,6 +8,12 @@ repo_url: https://github.com/armbian/documentation
 edit_uri: edit/main/docs/
 repo_name: armbian/documentation
 
+# docs/README.md is a folder placeholder for GitHub's directory view; it
+# collides with index.md as the site home. Exclude it from the build so
+# `mkdocs build --strict` does not abort on the conflict warning.
+exclude_docs: |
+  /README.md
+
 theme:
     name: material
     custom_dir: overrides