Update web icons to be consistent with recent changes.

_docs/help.html

@@ -124,7 +124,7 @@ a photo. In some cases, you can also hold (long press) for a continuous burst:</
     smaller video icon will switch to video mode. The photo and video icons will then swap: click the larger video icon to
     start/stop video recording, and click the smaller photo icon to switch back to photo mode.</p>
 
-<p><img src="switch_camera.png" alt="Switch Camera icon" width="32" height="32"><b>Switch camera</b> - Switches between front and back camera (if your
+<p><img src="baseline_switch_camera_white_48.png" alt="Switch Camera icon" width="32" height="32"><b>Switch camera</b> - Switches between front and back camera (if your
 device has both front and back cameras). If your device has more than one front and/or back camera, then this will switch
 between the first front and back camera.</p>
 
@@ -487,7 +487,7 @@ affects taking photos.</p>
 
 <p><b>Pause after taking photo</b> - If ticked, after taking a photo the display will pause, with options to share
 <img src="share.png" alt="Share icon" width="32" height="32"> or delete
-<img src="trash.png" alt="Trash icon" width="32" height="32"> the
+<img src="baseline_delete_white_48.png" alt="Trash icon" width="32" height="32"> the
 photo. To keep the photo and continue, touch the screen, press back, or take another photo. Note that this isn't supported
 when holding the shutter button to take a continuous burst of photos.</p>