Add RAG Landing Page (#1168)

* Add RAG Landing Page

* fix

* fix form, image and links

* fix

* Content update

* shortened file link

* update links

qdrant-landing/content/retrieval-augmented-generation/rag-evaluation-guide-form.md

@@ -0,0 +1,23 @@
+---
+title: What you will learn
+listTitle: "The guide covers:"
+list:
+- id: 0
+  text: Recommended frameworks for comprehensive RAG assessment
+- id: 1
+  text: How to identify and solve common RAG performance issues
+- id: 2
+  text: Techniques for working with custom datasets
+- id: 3
+  text: Essential metrics to monitor during testing, and more.
+form:
+  title: Download the guide
+  id: download-the-guide-form
+  hubspotFormOptions: '{
+   "region": "eu1",
+    "portalId": "139603372",
+    "formId": "a0975b6c-fad8-43f8-9e9e-c526e710fe90",
+    "submitButtonClass": "button button_contained",
+  }'
+sitemapExclude: true
+---