pre-commit: add markdown-link-check config and ignore links

https://github.com/tcort/markdown-link-check?tab=readme-ov-file#config-file-format

.github/linters/mlc_config.json

@@ -0,0 +1,7 @@
+{
+  "ignorePatterns": [
+    {
+      "pattern": "^https://github.com/mruby/mruby/commit/.*"
+    }
+  ]
+}

.pre-commit-config.yaml

@@ -72,7 +72,7 @@ repos:
       - id: markdown-link-check
         name: Run markdown-link-check
         description: Checks hyperlinks in Markdown files
-        args: [-q]
+        args: [--config=.github/linters/mlc_config.json, -q]
         types: [markdown]
         files: \.(md|mdown|markdown)$
   - repo: https://github.com/adrienverge/yamllint