Update docs content from https://github.com/depot/app

Author: goller

content/cache/overview.mdx

@@ -36,3 +36,7 @@ This means that build artifacts are shared between different members of your tea
 ## Pricing
 
 Depot Cache is available on all of our pricing plans. Each plan includes a block of cache storage. Each additional GB over the included amount is billed at **$0.20/GB/month**. See our [pricing page](/pricing) for more details.
+
+## Cache Retention
+
+Depot Cache retains build artifacts for a configurable amount of time. By default, artifacts are retained for 14 days. You can configure this retention period in the Depot Cache settings.