Remove structural CSS from docs, delegate layout to Starlight (#3736)

Author: Copilot

.github/workflows/daily-multi-device-docs-tester.lock.yml

@@ -24,3 +24,10 @@ pnpm-debug.log*
 test-results/
 playwright-report/
 playwright/.cache/
+custom-original.css
+custom.css.backup
+take-screenshots.mjs
+test-results/
+playwright-report/
+screenshots/
+*.png

docs/.gitignore

@@ -51,6 +51,7 @@ Status of all agentic workflows. [Browse source files](https://github.com/github
 | [Lockfile Statistics Analysis Agent](https://github.com/githubnext/gh-aw/blob/main/.github/workflows/lockfile-stats.md) | claude | [![Lockfile Statistics Analysis Agent](https://github.com/githubnext/gh-aw/actions/workflows/lockfile-stats.lock.yml/badge.svg)](https://github.com/githubnext/gh-aw/actions/workflows/lockfile-stats.lock.yml) | `0 3 * * *` | - |
 | [MCP Inspector Agent](https://github.com/githubnext/gh-aw/blob/main/.github/workflows/mcp-inspector.md) | copilot | [![MCP Inspector Agent](https://github.com/githubnext/gh-aw/actions/workflows/mcp-inspector.lock.yml/badge.svg)](https://github.com/githubnext/gh-aw/actions/workflows/mcp-inspector.lock.yml) | `0 18 * * 1` | - |
 | [Mergefest](https://github.com/githubnext/gh-aw/blob/main/.github/workflows/mergefest.md) | copilot | [![Mergefest](https://github.com/githubnext/gh-aw/actions/workflows/mergefest.lock.yml/badge.svg)](https://github.com/githubnext/gh-aw/actions/workflows/mergefest.lock.yml) | - | `/mergefest` |
+| [Multi-Device Docs Tester](https://github.com/githubnext/gh-aw/blob/main/.github/workflows/daily-multi-device-docs-tester.md) | claude | [![Multi-Device Docs Tester](https://github.com/githubnext/gh-aw/actions/workflows/daily-multi-device-docs-tester.lock.yml/badge.svg)](https://github.com/githubnext/gh-aw/actions/workflows/daily-multi-device-docs-tester.lock.yml) | `0 9 * * *` | - |
 | [Plan Command](https://github.com/githubnext/gh-aw/blob/main/.github/workflows/plan.md) | copilot | [![Plan Command](https://github.com/githubnext/gh-aw/actions/workflows/plan.lock.yml/badge.svg)](https://github.com/githubnext/gh-aw/actions/workflows/plan.lock.yml) | - | `/plan` |
 | [Poem Bot - A Creative Agentic Workflow](https://github.com/githubnext/gh-aw/blob/main/.github/workflows/poem-bot.md) | copilot | [![Poem Bot - A Creative Agentic Workflow](https://github.com/githubnext/gh-aw/actions/workflows/poem-bot.lock.yml/badge.svg)](https://github.com/githubnext/gh-aw/actions/workflows/poem-bot.lock.yml) | - | `/poem` |
 | [PR Nitpick Reviewer 🔍](https://github.com/githubnext/gh-aw/blob/main/.github/workflows/pr-nitpick-reviewer.md) | copilot | [![PR Nitpick Reviewer 🔍](https://github.com/githubnext/gh-aw/actions/workflows/pr-nitpick-reviewer.lock.yml/badge.svg)](https://github.com/githubnext/gh-aw/actions/workflows/pr-nitpick-reviewer.lock.yml) | - | - |