Dark Mode Preview (#370)

* (DOCSP-20428): Compass dark mode

* add line breaks

* adjust image dimensions

* Revert "adjust image dimensions"

This reverts commit fb4f80ebc70189b3d0283c90c02d0d01358bbf32.

* trying to change dimensions again

* add line break

* wording tweaks

* fix alt text

* add version added

Author: jeff-allen-mongo

source/dark-mode.txt

@@ -0,0 +1,34 @@
+.. _dark-mode:
+
+================
+Enable Dark Mode
+================
+
+.. default-domain:: mongodb
+
+.. contents:: On this page
+   :local:
+   :backlinks: none
+   :depth: 1
+   :class: singlecol
+
+.. versionadded:: 1.30.1
+
+You can configure |compass| to use a dark theme. To choose your theme,
+modify the :guilabel:`Theme` setting.
+
+- On macOS the :guilabel:`Theme` setting is in the :guilabel:`MongoDB
+  Compass` system menu:
+
+  .. figure:: /images/compass/compass-dark-mode-macos.png
+     :figwidth: 550px
+     :alt: Enable dark mode on macOS
+  
+  |
+
+- On Windows and Linux, the :guilabel:`Theme` setting is in the
+  :guilabel:`View` menu:
+
+  .. figure:: /images/compass/compass-dark-mode-windows.png
+     :figwidth: 550px
+     :alt: Enable dark mode on Windows and Linux

source/images/compass/compass-dark-mode-macos.png

@@ -157,6 +157,7 @@ Expand your knowledge of MongoDB by using Compass with other MongoDB products.
    /import-export
    /embedded-shell
    /aggregation-pipeline-builder
+   /dark-mode
    /troubleshooting
    /faq
    /learn-more