docs(quickstart): add install, onboard, and investigation demo GIFs

docs/quickstart.mdx

@@ -17,11 +17,19 @@ slug: "quickstart"
         ```bash
         curl -fsSL https://install.opensre.com | bash
         ```
+
+        <Frame>
+          ![Installing OpenSRE with the one-line curl installer](/images/quickstart-install.gif)
+        </Frame>
       </Tab>
       <Tab title="Windows">
         ```powershell
         irm https://install.opensre.com | iex
         ```
+
+        <Frame>
+          ![Installing OpenSRE on Windows with the PowerShell installer](/images/quickstart-install-windows.gif)
+        </Frame>
       </Tab>
     </Tabs>
 
@@ -34,6 +42,19 @@ slug: "quickstart"
     opensre onboard
     ```
 
+    <Tabs>
+      <Tab title="macOS / Linux">
+        <Frame>
+          ![Onboarding OpenSRE with the setup wizard to configure your LLM provider and integrations](/images/quickstart-onboard.gif)
+        </Frame>
+      </Tab>
+      <Tab title="Windows">
+        <Frame>
+          ![Onboarding OpenSRE on Windows with the setup wizard](/images/quickstart-onboard-windows.gif)
+        </Frame>
+      </Tab>
+    </Tabs>
+
   </Step>
 
   <Step title="Run an investigation">
@@ -53,6 +74,19 @@ slug: "quickstart"
 
     For file-based runs, OpenSRE fetches alert context, reasons across connected systems, and generates a structured root-cause report.
 
+    <Tabs>
+      <Tab title="macOS / Linux">
+        <Frame>
+          ![Running an OpenSRE investigation on a sample alert through to a structured root-cause report](/images/quickstart-investigate.gif)
+        </Frame>
+      </Tab>
+      <Tab title="Windows">
+        <Frame>
+          ![Running an OpenSRE investigation on Windows through to a structured root-cause report](/images/quickstart-investigate-windows.gif)
+        </Frame>
+      </Tab>
+    </Tabs>
+
   </Step>
 
   <Step title="Keep up to date">