feat: add GitHub Actions CI/CD workflows

[anujmindfire]

• ci.yml: Run on all pushes/PRs. Checks: formatting (gofumpt), imports (gci), lint (golangci-lint), build, tests, go mod tidy
• release.yml: Trigger on v* tags. Builds binaries for linux (amd64/arm64), darwin (amd64/arm64), windows (amd64). Generates checksums and creates GitHub Release
• release-docs.yml: Trigger on main branch pushes. Builds Docusaurus documentation and deploys to gh-pages branch

Pull Request Title

Provide a brief title that describes your changes (e.g., "Add feature X" or "Fix issue #123").

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Description

What does this PR do?

Provide a concise summary of your changes and what issue or feature they address.

Related Issues

Link any related issue(s) with references to help reviewers understand the context.

• Closes #ISSUE_NUMBER (if applicable)

Type of Change

• 🐛 Bug fix
• 🚀 New feature
• 📄 Documentation update
• ⚙️ Code refactoring
• 🔧 Configuration or CI/CD change
• 🧹 Maintenance or dependency update

Checklist

Please ensure the following have been completed before submitting:

• I have formatted my code using gofumpt.
• I have managed imports using goimports or gci.
• I have run linter using golangci-lint.
• I have run tests using go test ./....
• I have updated the documentation as needed.
• I have added or updated tests for the changes in this PR.

Screenshots (if applicable)

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Additional Context

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yml

Review profile: ASSERTIVE

Plan: Pro

Run ID: b597bb86-fd7c-42b6-a9ad-a2bbd8ddf2a1

📥 Commits

Reviewing files that changed from the base of the PR and between ec22af1 and 45ec3e1.

📒 Files selected for processing (7)

• .github/workflows/ci.yml
• .github/workflows/release-docs.yml
• .github/workflows/release.yml
• CONTRIBUTING.md
• README.md
• apps/cli/tests/crawler_test.go
• apps/cli/tests/storage_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/ci-cd-workflows

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