Add basic overviews.

CHANGELOG.md

@@ -747,7 +747,7 @@ Both `listener.js` and usage of key codes were outdated and caused unnecessary i
 
 ### Feature
 
-- Add ability to override high-level, CSS container classes via the `customClasses` prop on `Chat` [#1159](https://github.com/GetStream/stream-chat-react/pull/1159). See the [docs](https://getstream.io/chat/docs/sdk/react/customization/06-css_and_theming/#custom-container-classes) for more information.
+- Add ability to override high-level, CSS container classes via the `customClasses` prop on `Chat` [#1159](https://github.com/GetStream/stream-chat-react/pull/1159). See the [docs](https://getstream.io/chat/docs/sdk/react/customization/css_and_theming/#custom-container-classes) for more information.
 - Allow custom message actions in the `VirtualizedMessageList` [#1166](https://github.com/GetStream/stream-chat-react/pull/1166)
 - While using the `MessageSimple` UI component, allow message grouping in the `VirtualizedMessageList` via the `shouldGroupByUser` prop [#1166](https://github.com/GetStream/stream-chat-react/pull/1166)
 - Add ability to customize the svg icons in the `MessageOptions` component [#1159](https://github.com/GetStream/stream-chat-react/pull/1159)
@@ -960,7 +960,7 @@ Both `listener.js` and usage of key codes were outdated and caused unnecessary i
 - We've replaced much of the library's hardcoded CSS with customizable variables [#927](https://github.com/GetStream/stream-chat-react/pull/927)
 - Variable support has been added for fonts, colors, border radius, padding, and margin
 - The `Chat` component now accepts a `customStyles` prop, an object type of CSS variables and value overrides
-- See the [CSS and Theming](https://getstream.io/chat/docs/sdk/react/customization/06-css_and_theming/) section of our docs
+- See the [CSS and Theming](https://getstream.io/chat/docs/sdk/react/customization/css_and_theming/) section of our docs
 for an example of how to implement
 
 ### Feature

docusaurus/docs/React/guides/customization/overview.mdx

@@ -4,3 +4,5 @@ sidebar_position: 1
 slug: /guides/customization/
 title: Overview
 ---
+
+When [Theming](../theming/overview.mdx) is not enough for how you want our chat SDK to look and behave, customization is the next step. By customizing specific components you can make precise adjustments to the look and feel of our SDK exactly where you need them.

docusaurus/docs/React/guides/theming/overview.mdx

@@ -4,3 +4,7 @@ sidebar_position: 1
 slug: /guides/theming/
 title: Overview
 ---
+
+After initial integration of our SDK, theming is the best option allowing you to alter the appearance and behaviour of our SDK. Through theming you should be able to create a chat experience that is fully on brand for your situation.
+
+In case theming our SDK is not enough, please look into our SDK [customization](../customization/overview.mdx) options instead. Customization allows you the outright replace specific components in our SDK, allowing you to add just the right amount of customization you need.