fix ci

Author: kt3k

.github/markdown-link-check.json

@@ -0,0 +1,10 @@
+{
+  "httpHeaders": [
+    {
+      "urls": ["https://"],
+      "headers": {
+        "Accept": "text/html"
+      }
+    }
+  ]
+}

.github/workflows/ci.yml

@@ -10,4 +10,4 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: denoland/setup-deno@v2
-      - run: deno -A npm:markdown-link-check@3.12.2 README.md
+      - run: deno -A npm:markdown-link-check@3.12.2 --config .github/markdown-link-check.json README.md