Remove stale template artifacts

[Chris-Wolfgang]

Summary

Removes stale template artifacts no longer present in repo-template. Pure deletion — no other changes.

Files removed

• SETUP.md
• docs/index.html

Why each one is stale

• docfx_project/_site/manifest.json — DocFX build artifact (output of docfx build). Should be generated, not checked in. repo-template does not have this file.
• SETUP.md — Replaced by REPO-INSTRUCTIONS.md in repo-template. Older naming convention.
• docs/index.html — Generated artifact; repo-template does not check in a docs/index.html.

Discovered via the template-drift-scan skill — these files appear in many downstream repos but are absent from the template. Same pattern as In-memory-Logger#21 which cleaned up the equivalent set there.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR removes stale template artifacts from the repository to align with the upstream repo-template and avoid checking in generated/obsolete files.

Changes:

• Deleted SETUP.md (obsolete setup checklist content).
• Deleted docs/index.html (placeholder/generated HTML artifact).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
SETUP.md	Removes obsolete setup documentation file.
docs/index.html	Removes placeholder/generated HTML page under docs/.

Comments suppressed due to low confidence (1)

SETUP.md:1

• SETUP.md is being deleted, but the solution still lists it under SolutionItems (TryPattern.sln). This leaves a broken/missing file entry when opening the solution. Remove the SETUP.md SolutionItems entry (or replace it with the intended replacement file, e.g. setup.md/REPO-INSTRUCTIONS.md).