fix/migration 3p11 (#5370)

platform/docs/versioned_docs/version-3.11/user-guide/viewer/index.md

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+---
+sidebar_position: 1
+sidebar_label: Overview
+---
+
+
+# Overview
+When you open a mode, viewport, toolbar and panels of the mode get shown.
+It is important to note that each mode has a different UI, which serves its purpose.
+Here we explain various components of `Basic Viewer` mode which includes measurement
+tracking functionalities.
+
+Basic viewer mode (longitudinal):
+
+![user-viewer](../../assets/img/user-viewer.png)
+
+Let's break different aspects of the viewer to the main components:
+
+- Left Panel (study panel): displays series thumbnails with series details
+- Viewport: renders the image and displays annotations
+- Right Panel (measurements): displays annotations details
+- Toolbar: displays tools and logo
+
+![user-viewer-components](../../assets/img/overview.png)
+
+
+
+
+Now, we explain each component and its sub-elements in detail.