add docs page for ai summaries (#1962)

Author: motatoes

docs/ee/ai-summaries.mdx

@@ -0,0 +1,14 @@
+---
+title: "AI Summaries"
+---
+
+AI Summaries allows you to generate a summary of multiple plans when you create a PR. This significantly reduces the cognitive load
+on a reviewer of that PR. Lets say someone updated a module that is relied on by multiple projects in a monorepo, this would lead to 20 different plans like in this screenshot:
+
+![multiple plans](/images/ee/ai-summaries.png)
+
+
+With AI summaries enabled a summary comment is posted summarise all of the plans below it.
+This means that the reviewer now only needs to read the summary and glance through all the plans, saving precious reviewer time!
+
+This is currently a invite-only feature so please [book a demo](https://digger.dev/) with us to request access!

docs/images/ee/ai-summaries.png

@@ -58,7 +58,8 @@
         "ee/multi-github",
         "ee/gitlab",
         "ee/buildkite",
-        "ee/fips-140"
+        "ee/fips-140",
+        "ee/ai-summaries"
       ]
     },
     {