docs: surface quick setup script in the Quick Start section

[Copilot]

The Quick Start section in docs/index.md only documented manual setup, which made the quick-setup.sh path hard to discover.

Changes

• Promotes the quick setup script as the primary Quick Start path:

curl -fsSL https://raw.githubusercontent.com/elastic/ai-github-actions/v0/scripts/quick-setup.sh \
  | bash -s --

• Clarifies required tooling for this flow (gh, git, and curl)

• Documents what the script does by default:

  • installs the starter workflow triggers
  • adds agentics-maintenance.yml
  • sets COPILOT_GITHUB_TOKEN
  • creates a branch, pushes it, and opens a PR

• Calls out --continuous-improvement for optional continuous-improvement workflow installation

• Keeps the existing manual setup steps as an alternative

• Fixes Refer to the quick start script in our quick start docs #432

Generated by Update PR Body for issue #433

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: Repository UI (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between b056f17 and 7d7ca45.

📒 Files selected for processing (1)

• docs/index.md

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📝 Walkthrough

Walkthrough

A new Quick Start section has been added to docs/index.md that documents a curl-based quick setup script invocation. The section includes default actions, optional flags (--continuous-improvement), and manual setup instructions for Copilot PAT configuration.

Changes

Cohort / File(s)	Summary
Quick Start Documentation docs/index.md	Added Quick Start section describing curl-based setup script invocation, default actions (workflow installation, branch creation, PR opening), and optional --continuous-improvement flag for selected workflows.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• docs: revamp docs as Elastic Agent Factory #365 — Modifies the same docs/index.md Quick Start section with curl-based installation and setup instructions.
• Add quick setup script for gh-aw workflows #173 — Implements the default actions and --continuous-improvement flag option being documented in this PR.

Poem

🐰 A script so quick, with just one bound,
Quick Start docs now spin around!
Curl and flow, then push with glee,
Workflows dance for all to see! 🚀

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: surfacing the quick setup script in the Quick Start documentation section.
Linked Issues check	✅ Passed	The PR fully addresses issue #432 by referencing the quick-setup.sh script in Quick Start docs, making the automated setup path discoverable.
Out of Scope Changes check	✅ Passed	All changes are directly related to the objective of surfacing the quick setup script in Quick Start documentation; no out-of-scope modifications detected.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch copilot/refactor-quick-start-script

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