docs: add screenshots

Author: bcoe

docs/product/insights/backend/index.mdx

@@ -6,7 +6,9 @@ description: "Learn how to use Sentry's Backend Performance tool to monitor thin
 
 <Include name="feature-limited-on-team-retention.mdx" />
 
-Sentry's [**Backend Performance**](https://sentry.io/orgredirect/organizations/:orgslug/insights/backend/) page gives you an overview of the health of your application. You'll be able to see things like the **Most Time-Consuming Queries**, **Most Time-Consuming Domains**, **p50** and **p75 Duration**, and so on. 
+Sentry's [**Backend Performance**](https://sentry.io/orgredirect/organizations/:orgslug/insights/backend/) page gives you an overview of the health of your application. You'll be able to see things like the **Most Time-Consuming Queries**, **Most Time-Consuming Domains**, **p50** and **p75 Duration**, and so on.
+
+![Backend performance overview page.](../img/backend-performance-overview.png)
 
 You can also dive deeper into Queries, Outbound API Requests, Caches, and Queues to get detailed information about potential issues affecting your application's health. In addition to having a dedicated space to monitor backend performance, you can also look at Sentry's **Insights** tab to monitor frontend, mobile, and AI performance. 
 

docs/product/insights/frontend/index.mdx

@@ -8,6 +8,8 @@ description: "Learn how to use Sentry's Frontend Performance tool to monitor thi
 
 Sentry's Frontend Performance page gives you an overview of the health of your application. You'll be able to see things like **Best Page Opportunities** (the improvements that would most help increase your performance score), your **Most Time-Consuming Assets**, **p50** and **p75 Duration**, and so on. 
 
+![Frontend performance overview page.](../img/frontend-performance-overview.png)
+
 You can also dive deeper into Web Vitals, Network Requests, and Assets to get detailed information about potential issues affecting your application's health. In addition to having a dedicated space to monitor frontend performance, you can also look at Sentry's **Insights** tab to monitor backend, mobile, and AI performance. 
 
 ## Learn More

docs/product/insights/img/backend-performance-overview.png

@@ -8,6 +8,8 @@ description: "Learn how to use Sentry's Mobile Performance tool to monitor the h
 
 The [**Mobile Performance**](https://sentry.io/orgredirect/organizations/:orgslug/insights/mobile/) page gives an overview of the metrics that let you know how fast your app starts, including the number of slow and frozen frames your users may be experiencing. Each metric provides insights into the overall performance health of your mobile application. Digging into the details helps prioritize critical performance issues and allows you to identify and troubleshoot the root cause faster.
 
+![Mobile performance overview page.](../img/mobile-performance-overview.png)
+
 ## App Start
 
 App start metrics track how long your mobile application takes to launch. For this, Sentry measures _cold starts_ and _warm starts_.