Get a single blog post excerpt by slug

Example response

{
  "data": {
    "title": "Mindfulness for Anxiety: A Complete Guide",
    "excerpt": "A practical, evidence-informed guide to using mindfulness for anxiety.",
    "tags": [
      "mindfulness",
      "anxiety"
    ],
    "canonical_url": "https://www.theholisticcare.com/blog/mindfulness-for-anxiety"
  },
  "meta": {
    "provider": "The Holistic Care",
    "source": "https://www.theholisticcare.com"
  }
}