fix(anchorLinks): add useRuntimeConfig imports

[nobkd]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

My new local projects always get the following error in edge channel:

500
useRuntimeConfig is not defined

View full log

Webpage:

500

useRuntimeConfig is not defined

at _sfc_main.setup (./node_modules/@nuxt/content/dist/runtime/components/Prose/ProseH1.js:39:23)
at callWithErrorHandling (./node_modules/@vue/runtime-core/dist/runtime-core.cjs.js:157:22)
at setupStatefulComponent (./node_modules/@vue/runtime-core/dist/runtime-core.cjs.js:7135:29)
at setupComponent (./node_modules/@vue/runtime-core/dist/runtime-core.cjs.js:7090:11)
at renderComponentVNode (./node_modules/@vue/server-renderer/dist/server-renderer.cjs.js:172:17)
at renderVNode (./node_modules/@vue/server-renderer/dist/server-renderer.cjs.js:299:22)
at renderComponentSubTree (./node_modules/@vue/server-renderer/dist/server-renderer.cjs.js:263:13)
at renderComponentVNode (./node_modules/@vue/server-renderer/dist/server-renderer.cjs.js:188:16)
at renderVNode (./node_modules/@vue/server-renderer/dist/server-renderer.cjs.js:299:22)

Console:

[Vue warn]: Unhandled error during execution of setup function 
  at <ProseH1 id="nuxt-content" >

This is obviously caused by the new anchorLinks option (--> the config checking in the heading prose components), so I added the necessary import.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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