refactor: use <CodeSnippet> in embed modal

[marcelgerber]

Just getting rid of some code that used to be duplicated.

They look a bit different, but not by all that much. Left is what's currently live, right is the new one:

[sophiamersmann]

Good call to get rid of duplicate code now that we have shared components!

I think it would be good though to use the appropriate colour scheme when used in Grapher. This is how I've done it as part of our data page / sources tab effort: https://github.com/owid/owid-grapher/blob/data-page-about-this-data/packages/%40ourworldindata/components/src/CodeSnippet/code-snippet.scss

I think it might make sense to wait with this PR until those changes are merged?

[marcelgerber]

I think it might make sense to wait with this PR until those changes are merged?

ah, right, makes sense of course! :)

[larsyencken]

@sophiamersmann Assigning this one to you to update/merge when you think it's ready, since Marcel's off now.

If that looks like a lot of work, you can close this PR for now without merging.