feat(showcase): use marked and prismjs to highlight the code

[fpaul-1A]

Proposed change

Following #2414
Replace all usage of highlight.js to prismjs

Related issues

- No issue associated -

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.84%. Comparing base (bbc4f26) to head (a1c247b).
Report is 11 commits behind head on main.

✅ All tests successful. No failed tests found.

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[kpanot]

Aligned the theme would be nice, they do not have css var that we can map to?

[fpaul-1A]

there are lots of themes we can choose from
I picked this theme to match the one we use in the training (as much as possible, prismjs uses regexes not actual grammar)

[kpanot]

Is it (with prism deps) required at root level dependency?

[fpaul-1A]

I didn't test without it but I believe we have to put all the deps at root level for the angular build

[kpanot]

But they are integrated as script and not angular component, so not sure :S