chore(demo): extract demos from Credo repo into standalone demo repositories

[believer-doer]

Summary

This PR addresses Issue #1499 extracting the demos from the main credo-ts repository into standalone demo repositories.

The goal is to keep the core repository focused on the Credo framework while allowing demos to evolve independently.

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Changes

• Extracted the demos from the main repository
• Added references to standalone demo repositories

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Demo Repositories

The extracted demos are now available in the following repositories:

• https://github.com/believer-doer/credo-demo-openid
• https://github.com/believer-doer/credo-demo

These repositories contain the full demo implementation previously included in this repo.

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Maintainer Action Required

To complete the extraction, maintainers may want to create equivalent repositories under the OpenWallet Foundation organization:

• openwallet-foundation/credo-demo-openid
• openwallet-foundation/credo-demo

The demo code can then be migrated or mirrored there.

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Motivation

Separating demos from the core repository:

• Keeps the Credo core repository smaller and easier to maintain
• Allows demos to evolve independently
• Reduces CI overhead
• Improves clarity between framework and examples

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Backwards Compatibility

No breaking changes to the core packages.
This PR only removes demo-related files from the repository.

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Related Issue

Fixes: #1499

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