Add comprehensive GitHub Copilot instructions with Docker Compose workflow

[Copilot]

This PR adds a comprehensive .github/copilot-instructions.md file that provides GitHub Copilot with detailed instructions for working effectively in the orionrobots.github.io codebase using Docker Compose as the primary development method.

What's Included

The instructions cover the complete Docker-first development workflow with validated commands and timing expectations:

Docker Compose Workflow

• Primary method: docker compose up for full development server (~4-5 minutes initial build)
• Manual builds: docker compose run dist (~30 seconds) and docker compose run build (~3 minutes)
• Testing: docker compose run test for containerized BDD tests
• Alternative native commands: npm-based workflow as fallback option

Site Configuration

• Hosting: Correctly identified as 3rd party hosting (not GitHub Pages-style)
• Technology stack: Fully migrated to Eleventy (11ty) from Jekyll
• Build pipeline: Webpack + Eleventy with Docker containerization

Comprehensive Coverage

• Proper timeout recommendations for long-running Docker builds
• Manual validation scenarios matching CI staging tests
• Repository structure and Jekyll-to-Eleventy migration context
• Troubleshooting workflows for both Docker and native environments
• Apache hosting configuration details

Development Safety

All commands include proper timeout recommendations with "NEVER CANCEL" warnings for long-running builds. Every timing estimate is based on actual Docker Compose performance testing.

The instructions follow the imperative tone requirement and provide exhaustive guidance to minimize incorrect commands while establishing Docker Compose as the intended primary development workflow.

Fixes #248.

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[dannystaple]

The updated branch should fix the docker compose 7 minute issue (staging shouldn't automatically start with docker compose up).
This repo is absolutely intended for use in a docker/docker compose environment - the instructions to the contrary should be removed.

The critical known issues should be fixed, but docker compose is what I have used for some time and should be the go to method.

[github-actions]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
❌ ACTION	actionlint	5		6	0	0.09s
✅ BASH	bash-exec	1		0	0	0.0s
✅ BASH	shellcheck	1		0	0	0.06s
⚠️ BASH	shfmt	1		1	0	0.0s
❌ C	cppcheck	8		8	0	0.21s
❌ CPP	cppcheck	8		8	0	0.21s
✅ JSON	npm-package-json-lint	yes		no	no	0.4s
✅ JSON	v8r	12		0	0	5.95s
❌ MARKDOWN	markdown-link-check	737		213	0	42.73s
✅ REPOSITORY	gitleaks	yes		no	no	14.5s
✅ REPOSITORY	git_diff	yes		no	no	0.79s
✅ REPOSITORY	grype	yes		no	no	34.08s
✅ REPOSITORY	secretlint	yes		no	no	42.77s
✅ REPOSITORY	syft	yes		no	no	1.56s
✅ REPOSITORY	trivy-sbom	yes		no	no	3.47s
✅ REPOSITORY	trufflehog	yes		no	no	4.7s
✅ XML	xmllint	1		0	0	192.72s
✅ YAML	v8r	13		0	0	6.42s

See detailed report in MegaLinter reports

[dannystaple]

@copilot can you address the comments here for me please?

[Copilot]

The updated branch should fix the docker compose 7 minute issue (staging shouldn't automatically start with docker compose up).
This repo is absolutely intended for use in a docker/docker compose env...

Updated the instructions to reflect Docker Compose as the intended primary development method. Removed all warnings about Docker being broken and provided proper Docker Compose commands with timing expectations. Native npm commands are now documented as alternatives (c75435d).

@copilot can you address the comments here for me please?

All comments have been addressed - updated site description, corrected Docker Compose as primary development method, and removed outdated Docker warnings (c75435d).