feat: Live updates UI refactor

[GuiLeme]

What does this PR do?

Refactors in general:

• Fix Performance issues and some memory leaks that we previously had;
• Fix UI's bad performance (scroll container kept flickering with children updated);
• Refactors UI's live-update overview with a zoom-in/out feature to focus on specific student (now it's a grid);
• Adds a pagination feature to the new grid (next step would be to make the maximum number of live-updates per page customizable - which it is already dynamically set);
• General code refactor to make it more readable;
• Makes h5p-standalone to render an iframe instead of a div in live-update feature;
• Change the deploy script to also include customized CSS.

More

See demonstration video below:

better-grid-view-demo-h5p-live-updates.mp4

[Arthurk12]

Left some minor comments below. Other than that, the PR looks great!

[Arthurk12]

LGTM!