Fix/code highlighting

[micheleriva]

🤔 This is a ...

• [ ] New feature
• [x] Bug fix
• [ ] Site / document update
• [ ] Component style update
• [ ] Refactoring
• [ ] Code style optimization
• [ ] Test Case
• [ ] Branch merge
• [ ] Other (what?)

🔗 Related issue link

Fixes #7

💡 Background and solution

Highlight.js was working only with the onBlur event. Now it works as soon as you type new code.

📝 Changelog

Language	Changelog
🇺🇸 English	Fixed highlight.js on keyUp event

☑️ Self Check before Merge

• [x] Doc is updated/provided or not needed
• [x] Demo/Example is updated/provided or not needed
• [x] Changelog is provided or not needed

This fix was possible thanks to this StackOverflow thread, I'll leave here the link for credits: https://stackoverflow.com/a/52347981/6442285

[micheleriva]

Converted the current PR to draft, I want to make some tests before asking for a review

[mqtik]

@micheleriva what's the status of this PR? Would love to try it out

[micheleriva]

@mqtik I'm not working on that anymore, I had to switch to another plugin. Sorry 😔