docs: add coding-agent installation and quickstart guides

[peteski22]

Summary

Adds a customer-facing installation guide and a quickstart guide to the docs site, and restructures the introduction so installation leads and reference material moves down.

New pages

• docs/install.md — installation guide for all seven supported hosts. Documents the files each cq install --target manages, uses per-host tabs for setup, and covers pointing an agent at a remote server via CQ_ADDR/CQ_API_KEY. Restores the Copilot/VS Code and Codex coverage dropped when the Python installer was retired.
• docs/quickstart.md — the hands-on walkthrough (verify the plugin, add your first knowledge unit, check the store), moved out of the README.

README / introduction

• Lead with Installation; link the CLI-binary install to the CLI README and the agent install to the new guide.
• Move the walkthrough into the quickstart guide.
• Move the "Published components and tags" reference table down.
• Cross-link remote-storage configuration to the per-host section of the guide; fix a stats → status tool-name typo.

DEVELOPMENT.md

• Replace the agent-install how-to and per-host configuration sections with pointers to the new guide.

Navigation

• Add both pages to docs/SUMMARY.md under Guides.

Verification

• scripts/check_docs.py passes (all internal links and anchors resolve).
• scripts/prepare_gitbook_site.py builds cleanly; the GitBook tab blocks and rewritten links were verified in the generated site.

Note

Publishes to docs.mozilla.ai/cq only after merge and a docs/vX.Y.Z release (per the docs workflow); the PR itself runs the docs validation job.

Summary by CodeRabbit

• Documentation
  • Simplified the main README and development guide, with clearer pointers to installation, quickstart and remote-server setup docs.
  • Added a new installation guide covering setup across supported coding agents and Windows.
  • Added a quickstart guide showing how to verify the integration and add a first knowledge item.
  • Updated the table of contents to include the new guides.
  • Clarified when an API key is needed for read-only versus write actions.

[coderabbitai]

Caution

Review failed

The pull request is closed.

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Run ID: a132cd23-7e58-4610-924e-184f35b14753

📥 Commits

Reviewing files that changed from the base of the PR and between 4b3bfee and 5686848.

📒 Files selected for processing (5)

• DEVELOPMENT.md
• README.md
• docs/SUMMARY.md
• docs/install.md
• docs/quickstart.md

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Walkthrough

Documentation is restructured: new docs/install.md and docs/quickstart.md guides are added, docs/SUMMARY.md is updated with corresponding TOC entries, and README.md/DEVELOPMENT.md are condensed to reference these guides instead of embedding detailed CLI/configuration instructions.

Changes

Documentation restructuring

Layer / File(s)	Summary
New installation guide docs/install.md	Adds end-to-end per-host installation documentation covering Claude Code, Codex, Copilot, Cursor, OpenCode, Pi, Windsurf, Windows setup, remote configuration, and advanced installer environment variables.
New quickstart guide docs/quickstart.md	Adds a guide for verifying the plugin, adding a first knowledge unit via cq:propose, re-checking the store, and links to follow-up docs.
Table of contents update docs/SUMMARY.md	Adds "Installation" and "Quickstart" entries under the Guides section.
README installation rework README.md	Restructures the Installation section to link to the new install guide, updates the environment variable table for CQ_API_KEY/CQ_ADDR, and repositions the "Published components and tags" section.
DEVELOPMENT.md simplification DEVELOPMENT.md	Condenses install and local agent configuration instructions into links pointing to docs/install.md.

Suggested labels: cli

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/agent-install-guide

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