💅🏼 Paper cuts (#925)

* add info on breadcrumbs to Navigation

* remove extra linebreak

* update API introduction

Author: ethanpalm

api-reference/introduction.mdx

@@ -1,28 +1,37 @@
 ---
-title: Introduction
+title: "Introduction"
+description: "Trigger updates, embed AI assistant, and more"
 icon: "book-open"
 ---
 
+The Mintlify REST API enables you to programmatically interact with your documentation, trigger updates, and embed AI-powered chat experiences.
+
+## Endpoints
+
+- [Trigger Update](/api-reference/update/trigger): Trigger an update of your site when desired.
+- [Get Update Status](/api-reference/update/status): Get the status of an update and other details about your docs.
+- [Generate Assistant Message](/api-reference/chat/create-assistant-message): Embed the assistant, trained on your docs, into any application of your choosing.
+
 ## Authentication
 
-You can generate an API key through [the dashboard](https://dashboard.mintlify.com/settings/organization/api-keys). The API key is associated with an entire organization and can be used across multiple deployments.
+You can generate an API key through [the dashboard](https://dashboard.mintlify.com/settings/organization/api-keys). API keys are associated with an entire organization and can be used across multiple deployments.
+
+### Admin API key
+
+The admin API key is used for the majority of the API. It is used to trigger updates and get update status.
 
-<Frame>
-  <img alt="Screenshot of the API keys page in the Mintlify dashboard." src="/images/external-api-key.png" />
-</Frame>
+Admin API keys begin with the `mint_` prefix. Keep your admin API keys secret.
 
-## Admin API key
+### Assistant API key
 
-The Admin API key is used for the majority of the API. It is used to trigger updates via the [Update endpoint](/api-reference/update/trigger).
+The assistant API key is used for generating assistant chat messages through the API. Responses include citations so you can point your users to the right destinations for more information.
 
-## Assistant API key
+Assistant API keys begin with the `mint_dsc_` prefix.
 
-The assistant API allows you to embed the AI assistant, trained on your docs and continually kept up to date, into any application of your choosing.
+The assistant API **key** is a server-side token that should be kept secret.
 
-Responses include citations so you can point your users to the right destinations for more information.
+The assistant API **token** is a public token that can be referenced in your frontend code.
 
 <Note>
-  The assistant API **token** is a public token that can be referenced in your frontend code. The API **key** is a server-side token that should be kept secret.
-  
   Calls using the assistant API token can incur costs: either using your AI chat credits or incurring overages.
 </Note>

navigation.mdx

@@ -398,9 +398,7 @@ We currently support the following languages:
 
 ## Nesting
 
-It's important to note that you can use any combination of anchors, tabs, and dropdowns - either one can be nested within each other interchangeably.
-
-This way, you can create a very complex navigation structure that is easy to manage.
+You can use any combination of anchors, tabs, and dropdowns. The components can be nested within each other interchangeably to create your desired navigation structure.
 
 <CodeGroup>
 
@@ -475,7 +473,6 @@ This way, you can create a very complex navigation structure that is easy to man
 }
 ```
 
-
 ```json Tabs with external anchors
 {
   "navigation": {
@@ -519,4 +516,18 @@ This way, you can create a very complex navigation structure that is easy to man
 }
 ```
 
-</CodeGroup>
+</CodeGroup>
+
+---
+
+## Breadcrumbs
+
+Control how breadcrumbs display on individual pages to orient users in your documentation.
+
+```json
+{
+  "styling": {
+    "eyebrows": "breadcrumbs"
+  }
+}
+```