docs: Minor updates and tidyup of the "Making Videos" seciton

source/en/latest/get-handbrake/check-for-updates.markdown

@@ -34,10 +34,6 @@ The Linux version of HandBrake does not have a built-in update checking feature.
 
 From the main menu, navigate to `HandBrake` and select `Check for Updates...`.
 
-![Check for Updates menu item](../images/mac/check-for-updates-menu-item.png)
-
-![Check for Updates dialog](../images/mac/check-for-updates.png)
-
 If an update is available, you will be given the opportunity to install it right away. To enable automatic updates, select the appropriate checkbox labeled `Automatically download and install updates in the future`.
 
 <!-- /.system-mac -->

source/en/latest/workflow/preview-settings.markdown

@@ -50,7 +50,6 @@ Select the `Preview` button to open the `Preview` window.
 <!-- /.system-lin -->
 <!-- .system-mac -->
 
-![Preview button](../images/mac/preview-button.png)
 
 ![Preview window](../images/mac/preview-window.png)
 
@@ -75,69 +74,23 @@ Move your mouse cursor over the `Preview` window, and some controls will appear.
 ![Preview controls](../images/mac/preview-controls.png)
 
 <!-- /.system-mac -->
-<!-- .system-win -->
-
-<!-- TODO: Windows figures. -->
-
-<!-- /.system-win -->
 
 Set the starting position by dragging the `Position` control left or right. Choose how many seconds of video you want to encode using the `Duration` control. Longer durations will take more time to encode.
 
-<!-- .system-lin -->
 
-<!-- TODO: Linux figures. -->
 
-<!-- /.system-lin -->
-<!-- .system-mac -->
-
-![Preview position control](../images/mac/preview-controls-position.png)
-
-![Preview duration control](../images/mac/preview-controls-duration.png)
-
-<!-- /.system-mac -->
-<!-- .system-win -->
-
-<!-- TODO: Windows figures. -->
-
-<!-- /.system-win -->
-
-<!-- .system-lin -->
-
-## Starting a Preview encode on Linux
-
-TODO: Linux instructions.
-
-<!-- TODO: Linux figures. -->
-
-<!-- /.system-lin -->
-<!-- .system-mac -->
 
 ## Starting a Preview encode on Mac
 
 When you're satisfied with your starting position and duration, select `Live Preview` and be patient. HandBrake will report its progress while it works. When your `Preview` is ready, it will play automatically. You can use the playback controls to pause, rewind, and replay your `Preview`.
 
+<!-- .system-mac -->
 ![Preview start control](../images/mac/preview-controls-start.png)
 
 ![Preview playing](../images/mac/preview-playing.png)
 
 <!-- /.system-mac -->
-<!-- .system-win -->
 
-## Starting a Preview encode on Windows
-
-TODO: Windows instructions.
-
-<!-- TODO: Windows figures. -->
-
-<!-- /.system-win -->
-
-## Finishing up
-
-<!-- .system-lin -->
-
-<!-- TODO: Linux figures. -->
-
-<!-- /.system-lin -->
 <!-- .system-mac -->
 
 To create a new `Preview`, select the `×` button to start over. When you're finished previewing your work, you may close the `Preview` window.
@@ -147,11 +100,6 @@ To create a new `Preview`, select the `×` button to start over. When you're fin
 ![Closing the preview window](../images/mac/preview-window-close.png)
 
 <!-- /.system-mac -->
-<!-- .system-win -->
-
-<!-- TODO: Windows figures. -->
-
-<!-- /.system-win -->
 
 ## Next steps
 

source/en/latest/workflow/select-preset.markdown

@@ -34,8 +34,6 @@ Once you've opened a `Source`, select the `Preset` that most closely describes t
 <!-- /.system-lin -->
 <!-- .system-mac -->
 
-![Presets](../images/mac/presets.png)
-
 ![Selecting a preset](../images/mac/preset-selection.png "Presets are one-click settings to save you time and help ensure compatibility with your devices.")
 
 <!-- /.system-mac -->

source/en/latest/workflow/start-encoding.markdown

@@ -57,19 +57,10 @@ Select the `Start` button on the toolbar to make your new video.
 ![Starting an encode](../images/mac/start-button.png "The Start button begins encoding.")
 
 <!-- /.system-mac -->
-<!-- .system-win -->
-
-<!-- TODO: Windows figures. -->
-
-<!-- /.system-win -->
 
 HandBrake will report its progress while it's working and alert you when it's finished. Then you will have a new video file at the `Destination` you specified.
 
-<!-- .system-lin -->
 
-<!-- TODO: Linux figures. -->
-
-<!-- /.system-lin -->
 <!-- .system-mac -->
 
 ![Encode progress](../images/mac/encode-progress.png "HandBrake reports its progress during encoding.")
@@ -77,11 +68,7 @@ HandBrake will report its progress while it's working and alert you when it's fi
 ![Encoding complete alert](../images/mac/encode-complete.png "HandBrake shows an alert when finished encoding.")
 
 <!-- /.system-mac -->
-<!-- .system-win -->
 
-<!-- TODO: Windows figures. -->
-
-<!-- /.system-win -->
 
 Congratulations! You just encoded your first video using HandBrake. It's now ready to watch on your devices.