Refactor: Simplify project setup

[martin-azpillaga]

Inspired by issue #3, this PR aims to reduce the friction when setting up the project.

It is a pure refactoring PR meaning no functionality has been changed. The original tests keep passing just as before.

The contributions are in three areas:

1. Npm packages

   • Simplify the project's build and execution process to a single npm script
   • Compile and bundle the project using npm packages: No need to install typescript or webpack globally
   • Update packages to fix known vulnerabilities, including 7 critical vulnerabilities

   

2. Resulting website

   • Separate html, css and js concerns
   • Bundle all js code into one module + one worker
   • Serve the static web using npm's serve package

   

3. Accessibility

   • Deploy to Github pages to try the editor using just a web browser
   • Document the set up process in the readme

   

To the reviewer:

• I recommend reviewing commits one by one chronologically.
• Don't be scared of the amount of lines changed. They come mostly from dependency chain changes in package-lock.json

[martin-azpillaga]

@alessiostalla
After the merge, the Github action is failing since Github pages is not enabled in this repository.
I suggest enabling it under the repository's Settings > Pages section.
This will create a static server hosting the editor webpage under a url similar to https://strumenta.github.io/calc-monaco-editor.
As a last step, I would redirect the try it online link of the README to this repository's github page URL here:
[online]: https://minim.tools/calc-monaco-editor/

This way the project is self contained, independent of my domain, and the webpage will get updated whenever the main branch receives new commits.