docs: add getting started videos to index landing page

[Copilot]

Integrates CLI quick-start and GitHub workflow creation videos into the index.mdx landing page to provide visual onboarding between the example code and workflow catalog.

Changes

• Added Video component import to index.mdx
• Created "Getting Started" section positioned after example code, before workflow catalog
• Embedded two videos without captions:
  • CLI installation and workflow addition (install-and-add-workflow-in-cli.mp4)
  • GitHub web interface workflow creation (create-workflow-on-github.mp4)
• Videos auto-detect matching .png thumbnails from /videos/ directory

Page Flow

The new section bridges the gap between conceptual example and exploration:

Example: Daily Issues Report (markdown → YAML concept)
    ↓
Getting Started (visual demonstration)  ← NEW
    ↓
Workflow Examples (catalog for exploration)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• telemetry.astro.build
  • Triggering command: /opt/hostedtoolcache/node/24.13.0/x64/bin/node node /home/REDACTED/work/gh-aw/gh-aw/docs/node_modules/.bin/astro build (dns block)
  • Triggering command: /opt/hostedtoolcache/node/24.13.0/x64/bin/node node /home/REDACTED/work/gh-aw/gh-aw/docs/node_modules/.bin/astro preview (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Integrate the videos from https://github.github.io/gh-aw/setup/quick-start/ and https://github.github.io/gh-aw/setup/creating-workflows/ into the index.mdx landing page. no captions. make the best guess to integrate them into the page flow

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[Copilot]

Pull request overview

This PR integrates getting-started video tutorials into the documentation landing page to provide visual onboarding for users. The videos demonstrate CLI-based workflow setup and GitHub web interface workflow creation, positioned strategically between the example code and workflow catalog sections.

Changes:

• Added Video component import to support embedded video playback
• Created "Getting Started" section with two instructional videos showing CLI and web-based workflow creation
• Removed empty div placeholder that previously occupied the space

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