Use uglify plugin instead of "immutable" string function for HTML toggle content function

[itsalb3rt]

Is your feature request related to a problem? Please describe.
Use modern solution for prevent webpack transpilation of necessary function for final documentation page.

// src/assets/js/TableOfContentUtil.js
/**
 * Prevent webpack transpilation
 */
const inmutableToggleContent = `
window.onload = function () {
  window.toggleContent = function (idEl, iconContainer) {
    const content = document.querySelector('#' + idEl)

    if (content.classList.contains('hide')) {
      iconContainer.textContent = '▼'
      content.classList.add('show')
      content.classList.remove('hide')
    } else if (content.classList.contains('show')) {
      iconContainer.textContent = '►'
      content.classList.add('hide')
      content.classList.remove('show')
    } else {
      content.classList.add('show')
    }
  }
}
`

Describe the solution you'd like
Use this plugin:
https://www.npmjs.com/package/uglifyjs-webpack-plugin

Following the quasar documentation:
https://quasar.dev/quasar-cli/handling-webpack

https://forum.quasar-framework.org/topic/5151/solved-how-to-add-a-webpack-plugin-and-require-file

Describe alternatives you've considered
NONE

Additional context

[Jadhielv]

I would like to help you with this @itsalb3rt