docs: fix incorrect paths

docs/latest/SUMMARY.md

@@ -27,7 +27,7 @@
     - [Toolbar](extensions/modules/toolbar.md)
     - [Viewport](extensions/modules/viewport.md)
   - [Contexts](extensions/index.md#contexts)
-  - [ExtensionManager](extensions/index.md#extension-manager)
+  - [ExtensionManager](extensions/index.md#extensionmanager)
   - [OHIF Maintained](extensions/index.md#maintained-extensions)
 - [Services](services/index.md)
   - [Default](services/default/index.md)

docs/latest/extensions/index.md

@@ -8,7 +8,7 @@
   - [Modules](#modules)
   - [Contexts](#contexts)
 - [Consuming Extensions](#consuming-extensions)
-  - [Extension Manager](#extension-manager)
+  - [Extension Manager](#extensionmanager)
 - [Maintained Extensions](#maintained-extensions)
 
 ## Overview

docs/latest/extensions/modules/panel.md

@@ -4,7 +4,7 @@ The panel module provides the ability to define `menuOptions` and `components`
 that can be used by the consuming application. `components` are React Components
 that can be displayed in the consuming application's "Panel" Component.
 
-![Panel Extension](../assets/img/extensions-panel.gif)
+![Panel Extension](../../assets/img/extensions-panel.gif)
 
 <center><i>A panel extension example</i></center>