Updated RAG and 404 pages (#1225)

qdrant-landing/content/retrieval-augmented-generation/retrieval-augmented-generation-guide.md

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+---
+label: A comprehensive guide
+icon:
+  src: /icons/outline/guidebook-blue.svg
+  alt: Guidebook
+title: Best Practices in RAG Evaluation
+description: Learn how to assess, calibrate, and optimize your RAG applications for long-term success.
+getGuideButton: 
+  text: Get the Guide
+  url: "/rag/rag-evaluation-guide/"
+image:
+  src: /img/retrieval-augmented-generation-evaluation/guide-graphic.svg
+  alt: RAG guide
+sitemapExclude: true
+---