Add Sanity CMS blog memory example

* Add sanity-blog-memory cookbook example

A complete example showing how to sync Sanity CMS blog posts to Hindsight
for semantic search and AI-powered content discovery.

Features:
- Document-based sync with upsert support
- Semantic search and temporal queries
- Related content discovery
- AI reflection for content insights
- Docker Compose setup for local development

Addresses vectorize-io/hindsight#161

* Fix variable shadowing in README example

Author: chindris-mihai-alexandru

sanity-blog-memory/.env.example

@@ -0,0 +1,21 @@
+# Hindsight Configuration
+HINDSIGHT_API_URL=http://localhost:8888
+HINDSIGHT_BANK_ID=blog-memory
+
+# Sanity CMS Configuration
+SANITY_PROJECT_ID=your-project-id
+SANITY_DATASET=production
+SANITY_API_VERSION=2024-01-09
+
+# LLM Provider (for Hindsight)
+# Hindsight needs an LLM for fact extraction and reflect operations
+# Choose one provider and set the corresponding API key
+
+# Option 1: OpenAI
+OPENAI_API_KEY=sk-...
+
+# Option 2: Google Gemini (free tier available)
+# GOOGLE_API_KEY=...
+
+# Option 3: Groq (free tier available)
+# GROQ_API_KEY=...

sanity-blog-memory/.gitignore

@@ -0,0 +1,21 @@
+# Dependencies
+node_modules/
+
+# Build output
+dist/
+
+# Environment
+.env
+.env.local
+
+# OS
+.DS_Store
+Thumbs.db
+
+# IDE
+.vscode/
+.idea/
+
+# Logs
+*.log
+npm-debug.log*