updated dj mix app to run in the browser without using pc

[abadoni5]

Summary

#218 the original lessons uses Tkinter GUI which requires pc to run, I solved that issue making the code run natively in browser.

Checklist

• [x] Variables, functions and comments are translated to Spanish
• [x] Functions follow underscore notation
• [x] Spell check done & typos fixed
• [x] All python code is PEP8 compliant
• [x] Test coverage with Playwright implemented; locators are Pyhton code
• [x] Reviewers assigned (all peers & at least 1 mentor)

Screenshots

[github-actions[bot]]

Published to http://pyar.github.io/PyZombis/329/index.html

[abadoni5]

@NicolasSandoval @reingart I tried implementing this idea. Please have a look, I am open to suggestions and possible errors in my approach.

[github-actions[bot]]

Published to http://pyar.github.io/PyZombis/329/index.html