[Documentation] Add Scenario README Files for Web Apps, Web APIs, Daemon, Azure Functions

[jmprieur]

The root README and quickstart docs reference scenario deep-dives under docs/scenarios/ (e.g., web-apps, web-apis, daemon, azure-functions). These do not exist in the current branch—resulting in broken links and impaired discoverability of scenario guidance.

Required Fixes:

• Create scenario landing pages: docs/scenarios/web-apps/README.md, docs/scenarios/web-apis/README.md, docs/scenarios/daemon/README.md, docs/scenarios/azure-functions/README.md with meaningful stub or initial content (structure, TODOs, and clear upgrade path for future contributors)
• Ensure all internal links (README, quickstarts, etc.) resolve and update navigation if required

PRs must target: feature/doc-modernization branch.

Affected structure: Scenario subfolders and cross-linking from docs/README.md, quickstarts