Fix: Corrected the guide URL for local development in turtledefs.js

[HarshJS30]

Description

When running Music Blocks locally, the guide link pointed to ../guide/guide.html, which doesn’t exist in the local environment.
This fix adds logic to detect if the app is running locally (localhost or 127.0.0.1) and uses ../guide/index.html instead.
In production, it retains the original guide link (https://musicblocks.sugarlabs.org/guide/guide.html).

Changes Made

• Updated GUIDEURL logic in js/turtledefs.js
• Added a hostname-based check for local vs production environments

---

Testing

Locally: Verified that clicking the guide link correctly opens /guide/index.html

File Modified

• js/turtledefs.js

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.