fix: fix code block width in a demo

[EscapedGibbon]

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[EscapedGibbon]

@stropitek seems like the issue kind of resolved itself. Going from code block to code editor and back seems to work fine in dev and in prod.
However I don't know how to modify it to remove the outline completely without any small scraps and without getting into the CodeBlock component itself. Some images have small stripe like this.

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[EscapedGibbon]

With images being all square the small outline is removed, so everything works correctly now. I removed image dimensions for now, I think it's better to do it properly in the PR for this issue:
#161