delete the .md & toc entry & png

Author: mikehoffms

microsoft-edge/dev-videos/index.md

@@ -122,7 +122,6 @@ See also:
 * [What's New in DevTools (Microsoft Edge 112)](../devtools-guide-chromium/whats-new/2023/04/devtools-112.md)<!-- has Video section -->
 * [Analyze CSS selector performance during Recalculate Style events](../devtools-guide-chromium/evaluate-performance/selector-stats.md) - CSS selector stats.
 * [View formatted JSON responses or files](../devtools-guide-chromium/json-viewer/json-viewer.md)
-* [Apply a color theme to DevTools](../devtools-guide-chromium/customize/theme.md)
 
 
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microsoft-edge/devtools-guide-chromium/customize/index-images/theme-setting.png

@@ -749,10 +749,6 @@
               href: devtools-guide-chromium/customize/index.md
               displayName: settings
 
-            - name: Apply a color theme to DevTools  # orig: "Enable dark theme"
-              href: devtools-guide-chromium/customize/theme.md
-              displayName: Settings, Preferences
-
             - name: Change DevTools placement (Undock, Dock to bottom, Dock to left)
               href: devtools-guide-chromium/customize/placement.md
               displayName: settings