Expand and improve examples (realistic HTML, auth scenarios, common options)

[aplgr]

Goal

Improve example quality and coverage so new users can copy/paste real-world requests.

Why

HTML→PDF services are often judged by “first 2 minutes experience”. Better examples = more adoption.

Scope

Add examples for:

• More realistic HTML:
  • external CSS + inline CSS
  • web fonts (and fallback behavior)
  • images (local + remote)
  • long pages / page breaks
• Auth scenarios:
  • public request (no key)
  • valid API key
  • invalid key (expected 401)
  • rate limit exceeded (expected 429)
• Common PDF options (if supported by the API):
  • page size, margins, landscape, print background

Acceptance criteria

• examples/ contains at least 3 “realistic” HTML inputs
• README references the examples and shows at least 2 full curl commands
• Examples are self-contained and reproducible locally

Notes / hints

If the API doesn’t support some PDF options yet, keep examples aligned with what exists today.