ci: replace GitHub markdown before publish to NPM

Author: scriptcoded

.github/workflows/release-please.yml

@@ -17,17 +17,26 @@ jobs:
         id: release
         with:
           release-type: node
+
       - uses: actions/checkout@v4
         if: ${{ steps.release.outputs.release_created }}
+
       - uses: actions/setup-node@v4
         with:
           node-version: 22
           registry-url: 'https://registry.npmjs.org'
         if: ${{ steps.release.outputs.release_created }}
+
       - run: npm ci
         if: ${{ steps.release.outputs.release_created }}
+
       - run: npm run build
         if: ${{ steps.release.outputs.release_created }}
+
+      - name: Replace GitHub-specific markdown
+        run: |
+          sed -i 's/\[!IMPORTANT\]/### Important 💡/g' README.md
+
       - name: Publish to NPM
         run: npm publish
         env: