Docs for high contrast mode in Kibana (#1986)

Update0 - 10/07 Currently checking with eng whether there are deployment
type restrictions that apply to this because I could not test it
successfully on cloud and serverless
Update 1 - 15/07: Holding as the team is trying to get this to work also
on cloud deployments
Update 2 - 21/07: The option was also added to the Appearance menu
available in cloud instead of the user profile's menu, so it's now
correctly available in Kibana no matter the deployment mode used.

I've put the new page next to the dark mode one under "Cloud account and
preferences" as it sounds like the current best place for personal
settings.

Closes: #1675

Author: florent-leborgne

cloud-account/dark-mode.md

@@ -6,7 +6,7 @@ applies_to:
 
 # Use dark mode in Kibana
 
-The dark mode changes Kibana's default light appearance to a darker and higher-contrast color theme. From the application header, you can turn on dark mode or synchronize the color mode with your operating system settings.
+The dark mode changes Kibana's default light appearance to a darker color theme. From the application header, you can turn on dark mode or synchronize the color mode with your operating system settings.
 
 :::{tip}
 If you're using {{ecloud}}, this setting only applies to the Kibana UI of your serverless projects and hosted deployments. If you'd like to change the {{ecloud}} Console color theme too, you must do so separately from its respective interface.
@@ -16,10 +16,15 @@ If you're using {{ecloud}}, this setting only applies to the Kibana UI of your s
 
 1. Open the user menu from the header.
 2. Select **Appearance**.
+   
+   :::{note}
+   On self-managed deployments of {{kib}}, this option is located on your profile page. To access it, select **Edit profile** from the header's user menu.
+   :::
+
 3. Choose a color mode:
 
     - **Light**: The default color mode of Kibana
-    - **Dark**: The dark and high-contrast color mode of Kibana
+    - **Dark**: The dark color mode of Kibana
     - **System**: Synchronizes Kibana's color mode with your system settings
     - **Space default**: Sets the color mode to the value defined in the [Space settings](kibana://reference/advanced-settings.md#kibana-general-settings)
 

cloud-account/high-contrast.md

@@ -0,0 +1,28 @@
+---
+description: Use high-contrast mode in Kibana.
+applies_to:
+  stack: ga 9.1
+  serverless: ga
+products:
+  - id: kibana
+---
+
+# Use high-contrast mode in Kibana
+
+You can change the interface contrast mode of Kibana to improve visibility and readability in low-light conditions.
+
+1. Open the user menu from the header.
+2. Select **Appearance**.
+   
+   :::{note}
+   On self-managed deployments of {{kib}}, this option is located on your profile page. To access it, select **Edit profile** from the header's user menu.
+   :::
+
+3. Choose an interface contrast mode:
+
+    - **System**: Synchronizes Kibana's contrast mode with your system settings.
+    - **Normal**: Normal contrast mode.
+    - **High**: The high-contrast color mode of Kibana.
+
+4. Select **Save changes**.
+5. Refresh the page to apply the selected contrast mode.

cloud-account/toc.yml

@@ -6,4 +6,5 @@ toc:
   - file: change-your-password.md
   - file: add-a-login-method.md
   - file: multifactor-authentication.md
-  - file: dark-mode.md
+  - file: dark-mode.md
+  - file: high-contrast.md