docs: improve changelog header with project links

lerna.json

@@ -15,7 +15,7 @@
       "conventionalCommits": true,
       "createRelease": "github",
       "changelogIncludeCommitsClientLogin": " - by @%l",
-      "changelogHeaderMessage": "## Multiple-Select-Vanilla, visit the GitHub Page [multiple-select-vanilla](https://github.com/ghiscoding/multiple-select-vanilla)",
+      "changelogHeaderMessage": "## Visit the [Multiple-Select-Vanilla](https://github.com/ghiscoding/multiple-select-vanilla) GitHub project or take a look at the [Live Demo](https://ghiscoding.github.io/multiple-select-vanilla)",
       "message": "chore(release): publish new version %v",
       "syncWorkspaceLock": true
     }