docs: add app settings page for theme & update images (#2161)

* docs: add app settings page for theme & update images

* docs: rename app settings page for clarity

* docs: fix placeholder alt text

Author: eglitise

README.md

@@ -33,7 +33,7 @@ various features for interacting with the app.
 
 When inspecting a mobile app, the Inspector looks like this:
 
-![Appium Inspector screenshot](./docs/assets/images/inspector-window.png)
+![Appium Inspector screenshot](./docs/assets/images/session-inspector.png)
 
 ## Installation
 

docs/assets/images/inspector-window.png

@@ -0,0 +1,14 @@
+---
+hide:
+    - toc
+
+title: Application Settings
+---
+
+The application settings can be accessed using the button in the top-right of the Session Builder screen.
+
+![Theme Selector Button](assets/images/theme-selector.png)
+
+The only currently available option is the ability to change the application theme. By default, the
+Inspector will match the system theme, but it is also possible to explicitly switch to a light or
+dark theme.

docs/assets/images/session-builder.png

@@ -11,6 +11,7 @@ The **Session Builder** is the default screen shown upon opening the Inspector.
 
 The user interface here can be divided into several groups:
 
+- [Application Settings](./app-settings.md)
 - [Configuration of Server Details](./server-details.md)
 - [Capability Builder tab](./capability-builder.md)
 - [Saved Capability Sets tab](./saved-capability-sets.md)

docs/assets/images/session-inspector.png

@@ -35,6 +35,7 @@ nav:
   - menu-bar.md
   - Session Builder:
       - session-builder/index.md
+      - session-builder/app-settings.md
       - session-builder/server-details.md
       - session-builder/capability-builder.md
       - session-builder/saved-capability-sets.md