fix: update url for monolith-code

[Haeri]

Updating existing application

Checklist

• [x] I have read and completed the checklist of Submission Guide
• [x] My application is open-source and has been created for at least 20 days
• [ ] My application is closed-source and here is a proof it uses Electron:

Description

My application is already listed in the apps directory. Just a small update to the url.