Changes to properly add a subsection in the docs

docs/manifest.json

@@ -497,6 +497,18 @@
 		"markdown_source": "../docs/reference-guides/interactivity-api/README.md",
 		"parent": "reference-guides"
 	},
+	{
+		"title": "Core Concepts",
+		"slug": "core-concepts",
+		"markdown_source": "../docs/reference-guides/interactivity-api/core-concepts/README.md",
+		"parent": "interactivity-api"
+	},
+	{
+		"title": "The Reactive and Declarative mindset",
+		"slug": "the-reactive-and-declarative-mindset",
+		"markdown_source": "../docs/reference-guides/interactivity-api/core-concepts/the-reactive-and-declarative-mindset.md",
+		"parent": "core-concepts"
+	},
 	{
 		"title": "Quick start guide",
 		"slug": "iapi-quick-start-guide",

docs/reference-guides/interactivity-api/core-concepts/README.md

@@ -0,0 +1,5 @@
+# Core Concepts
+
+This section provides some guides on important concepts and mental models related to the Int block development. Use the following links to learn more:
+
+1. **[The Reactive and Declarative mindset](https://developer.wordpress.org/block-editor/reference-guides/interactivity-api/core-concepts/the-reactive-and-declarative-mindset):** This guide covers core concepts of reactivity and declarativeness, providing a foundation for effective use of the Interactivity API.

docs/reference-guides/interactivity-api/core-concepts/the-reactive-and-declarative-mindset.md

@@ -1,3 +1,5 @@
+# The Reactive and Declarative mindset
+
 The Interactivity API is a reactive and declarative framework, similar to other modern frameworks like React, Vue, Svelte, or Alpine. When working with the Interactivity API, adopting the right mindset is crucial for maximizing its potential. This guide will explain the core concepts of reactivity and declarativeness, providing a foundation for effective use of the Interactivity API.
 
 ## Understanding Declarative vs. Imperative Code

docs/toc.json

@@ -204,6 +204,13 @@
 			},
 			{
 				"docs/reference-guides/interactivity-api/README.md": [
+					{
+						"docs/reference-guides/interactivity-api/core-concepts/README.md": [
+							{
+								"docs/reference-guides/interactivity-api/core-concepts/the-reactive-and-declarative-mindset.md": []
+							}
+						]
+					},
 					{
 						"docs/reference-guides/interactivity-api/iapi-quick-start-guide.md": []
 					},