Update a bunch of images

docs/configure/sidebar-and-urls.md

@@ -4,7 +4,7 @@ title: 'Sidebar & URLS'
 
 Storybook’s sidebar lists all your stories grouped by component. When you have many components, you may also wish to group those components. To do so, you can add the `/` separator to the `title` of your CSF file, and Storybook will group the stories into groups based on common prefixes:
 
-![Storybook sidebar anatomy](./sidebar-anatomy.jpg)
+![Storybook sidebar anatomy](./sidebar-anatomy.png)
 
 We recommend using a nesting scheme that mirrors the filesystem path of the components. For example, if you have a file `components/modals/Alert.js`, name the CSF file `components/modals/Alert.stories.js` and title it `Components/Modals/Alert`.
 
@@ -12,7 +12,7 @@ We recommend using a nesting scheme that mirrors the filesystem path of the comp
 
 By default, Storybook will treat your top-level nodes as “roots”. Roots are displayed in the UI as “sections” of the hierarchy. Lower level groups will show up as folders:
 
-![Storybook sidebar story roots](./sidebar-roots.jpg)
+![Storybook sidebar story roots](./sidebar-roots.png)
 
 If you’d prefer to show top-level nodes as folders rather than roots, you can set the `sidebar.showRoots` option to `false` in [`./storybook/manager.js`](./overview.md#configure-story-rendering):
 

docs/configure/storybook-addons.md

@@ -10,7 +10,7 @@ Addons are integral to the way Storybook works. Many of Storybook's core feature
 
 The most obvious thing addons affect in Storybook is the UI of Storybook itself. Within the UI the **toolbar** and **addons panel** are the two chief places addons will appear.
 
-![Storybook addons locations](./addon-locations.jpg)
+![Storybook addons locations](./addon-locations.png)
 
 Addons can also hook into the rendering of your story in the preview pane via injecting their own [decorators](../writing-stories/decorators.md).
 

docs/contribute/code.md

@@ -31,7 +31,8 @@ It will install the required prerequisites, build the code, create and link a st
 
 If all goes well, you should see the sandbox running.
 
-![Storybook Sandbox Running](./storybook-sandbox.png)
+![Storybook sandbox running](../get-started/example-welcome.png)
+
 
 ## Running a different sandbox template
 
@@ -89,7 +90,7 @@ If the work you'll be doing affects the `Preview` (the innermost Storybook `ifra
 
 Otherwise, if it affects the `Manager` (the outermost Storybook `iframe` where the addons are displayed), you'll need to refresh manually after saving.
 
-![Storybook UI](./storybook-manager-preview.jpg)
+![Storybook manager preview](../addons/manager-preview.png)
 
 ## Check your work