fix(astro-angular): warn about shiki in mdx astro integration and override with prism

[rlmestre]

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What kind of change does this PR introduce?

• Bugfix
• Documentation content changes

Which package are you modifying?

• astro-angular

What is the current behavior?

Closes #690
Closes #653

What is the new behavior?

Does this PR introduce a breaking change?

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• No

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