fix (docs): update Hono examples to use the text/event-stream content type

[hkjorgensen]

The current documentation explicitly sets the Content-Type header to text/plain, which disables streaming functionality in browsers, defeating the purpose of streaming data. When set to text/plain, browsers wait for the HTTP request to complete before passing data to client-side logic.

This issue can be resolved by changing the HTTP header Content-Type to text/event-stream.

[lgrammel]

Technically we are not sending SSE at the moment, which is why I'm hesitant to change the example (see https://chatgpt.com/share/e/67a33631-bb04-8000-9fa0-cf417cc6c53a for more details).

Which browser / setup caused you issues with the text/plain configuration?

I'm considering changing how we sent data to SSEs, but I want to understand where the current approach fails in more detail, with reproducible examples.

[entelligence-ai-reviews]

Walkthrough

Updated Content-Type headers from text/plain; charset=utf-8 to text/event-stream in 30-hono.mdx and server.ts files.

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