Add GeoZarr Mini Spec to navigation in mkdocs configuration

Author: emmanuelmathot

mkdocs.yml

@@ -66,5 +66,6 @@ nav:
   - API Reference: api-reference.md
   - Examples: examples.md
   - Architecture: architecture.md
+  - GeoZarr Mini Spec: geozarr-minispec.md
   - GeoZarr Specification: geozarr-specification-contribution.md
   - FAQ: faq.md