Modernizes MVC

[its-ChaTTy]

Summary

Modernized MVC Lecture, TWP52 (both english & spanish). The lesson previously was written in Tkinter GUI for desktop apps, looking outdated and requiring a PC to execute it. So this PR rewrites the code for the web (HTML5) and make the lesson interactive in the browser using Brython Event Handlers. Partially completes #217

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

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Published to http://pyar.github.io/PyZombis/322/index.html