Add section for mdformat but disable it for now.

See executablebooks/mdformat-myst#9 for more details.

.pre-commit-config.yaml

@@ -75,3 +75,14 @@ repos:
         -   typescript
         -   '@typescript-eslint/eslint-plugin'
         -   '@typescript-eslint/parser'
+
+# Commented out until mdformat-myst supports custom extensions
+# See https://github.com/executablebooks/mdformat-myst/pull/9
+# -   repo: https://github.com/executablebooks/mdformat
+#     rev: 0.7.14 # Use the ref you want to point at
+#     hooks:
+#     -   id: mdformat
+#         additional_dependencies:
+#         -   mdformat-gfm
+#         -   mdformat-myst
+#         -   mdformat-black