docs: fix useResource example & remove unused demo

[ianlet]

What is it?

• [ ] Feature / enhancement
• [ ] Bug
• [x] Docs / tests / types / typos
• [ ] Infra

Description

Fixes https://github.com/orgs/QwikDev/projects/1/views/2?pane=issue&itemId=72272653

The previous useResource example was using the github api, which might get rate limited. Instead, the example now uses a free fake and stable API. Potential errors are also caught in order to avoid other issues.

In addition, this PR deletes the unused demo demo/tasks/resource

Note: the error mentioned in the issue doesn't actually happen in local. So this is a bit of a wild guess as to why it might fail in production.

Checklist:

• [x] My code follows the developer guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have ran pnpm change and documented my changes
• [x] I have made corresponding changes to the Qwik docs
• [x] Added new tests to cover the fix / functionality

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 278695ad45ad7bc488c6245b3e15e5b8b0c4a49b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

| Name | Type | | --------------------- | ----- | | @builder.io/qwik | Patch | | eslint-plugin-qwik | Patch | | @builder.io/qwik-city | Patch | | create-qwik | Patch |

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