Replace broken file:// demo link in Session 15 resources

[danbaruka]

Problem

Session 15 (dApp Architecture) resources include a local-only link that cannot work for other contributors or site visitors:

• File: website/docs/working-group/sessions/q2-2026/15-dapp-architecture-demo/session-resources/readme.md
• Link: file:///Users/tyty/Desktop/Demos/cardano-dapp-demo (“Educational dApp Demo”)

This is a user-facing broken resource on the DevEx site.

Proposed solution

1. Replace the file:// href with a public GitHub repo, gist, or published demo URL if one exists.
2. If no public source is available yet, remove the dead link and note that the demo is private / TBA, with a follow-up to add the URL when ready.
3. Optionally scan docs for any other file:// links and clean them in the same PR.

Acceptance criteria

• No file:// links remain in published Session 15 resources
• Replacement is a working public URL, or an explicit TBA note without a broken href
• npm run build in website/ succeeds

Context

Part of maintainer work: Address any critical bugs or blockers.

[CHRISLeGURU]

Hi dan,

I found the public GitHub URL of the educational dApp demo (Session 15) and have successfully replaced the broken file:// link as specified in issue #267.

Changes made:

• Original: file:///Users/tyty/Desktop/Demos/cardano-dapp-demo
• New: https://github.com/Emmanuel-Tyty/Demos/tree/main/cardano-dapp-demo

PR LINK
https://github.com/IntersectMBO/developer-experience/pull/270