Fix TS errors and replace getAdapterLogger in modules/astro-app

[ArmandPhilippot]

Description (required)

Follow-up of #14089. TL;DR: Improve UX by preventing the appearance of red squiggles (TS) and visual changes (formatting with Astro extension) when the user copies and pastes a code snippet.

Formats and fixes code snippets in modules/astro-app.mdx:

• createApp(): useless import and we have the following error Property 'respondWith' does not exist on type 'Event'.ts(2339)... The fix I'm suggesting is only available when setting webworker in compilerOptions.lib but I guess this is expected: on MDN, they say that "This feature is only available in Service Workers."
• We have a bunch of very short code snippets like app.render()... those can be confusing for users (e.g. where does request comes from). I tried to integrate them into a complete example (not an adapter expert though...). And I converted them as TypeScript examples: I believe it's easier to remove the types rather than wasting time to find them.
• app.getAdapterLogger(): doesn't exist. It was removed in 6.3.0 with experimental advanced routing. But, we have app.adapterLogger (a getter) since 6.2.0. So, I updated the heading, the signature, <Since />, and the code snippet.

References

• Related to Fix TypeScript errors in "Configuration" & "Routing and navigation" code snippets #14089

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

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[yanthomasdev]

LGTM! Good work!