chore: remove legacy scripts and scrub docs to CI/CD pull-based deployment

[Fortinbra]

This PR removes confusing legacy local build/deploy scripts and updates documentation to reflect the CI/CD-first, pull-based deployment workflow.

Changes

• Remove legacy-scripts/ directory (build-docker-windows.ps1, deploy-to-pi.ps1, deploy.ps1, deploy.sh, docker-compose.old.yml, load-and-deploy.sh, README.md)
• README.md: Replace one-command script ref with clean deployment pointers to DEPLOY-QUICKSTART.md and README.Docker.md
• README.Docker.md: Strip script references; focus on pulling pre-built images and docker compose on target
• DEPLOY-QUICKSTART.md: Remove script flows; add simple pull + up -d flow and common commands
• docs/ci-cd-deployment.md: Replace deprecated-files list with a concise note that they’re removed
• .github/copilot-instructions.md: Clarify legacy scripts fully removed, do not reintroduce
• .dockerignore: Drop entries for removed scripts

Rationale

• Prevent confusion with unsupported local build/deploy paths
• Align all docs with section 34 of Copilot Instructions and the CI/CD pipeline

How to validate

• grep repo for legacy-scripts, deploy-to-pi.ps1, build-docker-windows.ps1, deploy.sh, deploy.ps1, load-and-deploy.sh – only the single instruction note remains
• Follow DEPLOY-QUICKSTART.md to deploy on Raspberry Pi using docker compose

Notes

• No runtime code changed; only deletions and documentation updates
• CI unaffected

[Copilot]

Pull Request Overview

This PR removes all legacy local build and deployment scripts, replacing them with a clean CI/CD-focused deployment workflow. The changes eliminate confusion between deprecated local Docker scripts and the current pull-based deployment model.

Key changes:

• Complete removal of the legacy-scripts/ directory containing all deprecated PowerShell and shell scripts
• Documentation updates to replace script references with guidance on pulling pre-built images from CI/CD
• Configuration cleanup to remove references to deleted scripts

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
legacy-scripts/	All files removed - PowerShell and shell scripts for local Docker builds and Pi deployments
README.md	Replaced script deployment section with links to deployment guides emphasizing CI/CD workflow
README.Docker.md	Removed scattered script references and cleaned up formatting inconsistencies
DEPLOY-QUICKSTART.md	Removed script-based deployment flows, focusing on pull and compose commands
docs/ci-cd-deployment.md	Simplified deprecated files section to note they've been removed
.github/copilot-instructions.md	Updated to clarify legacy scripts are fully removed and should not be reintroduced
.dockerignore	Removed entries for deleted deployment scripts

[Copilot]

Pull Request Overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated 6 comments.

Comments suppressed due to low confidence (1)

README.Docker.md:75

• Orphaned PowerShell code block marker. This appears to be a formatting error where a code block was started but not properly closed or the content was removed.

The workflow creates multiple tags:```powershell