Drop design-principles page

firebase.json

@@ -35,6 +35,7 @@
       { "source": "/docs/development/ui/widgets/catalog", "destination": "/docs/development/ui/widgets", "type": 301 },
       { "source": "/docs/reference/widgets/widgetindex", "destination": "/docs/reference/widgets", "type": 301 },
       { "source": "/docs/reference/widgets/:catalogpage+", "destination": "/docs/development/ui/widgets/:catalogpage+", "type": 301 },
+      { "source": "/docs/resources/design-principles", "destination": "https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo", "type": 301 },
 
 
       { "source": "/accessibility", "destination": "/docs/development/accessibility-and-localization/accessibility", "type": 301 },
@@ -55,7 +56,7 @@
       { "source": "/cookbook/:rest*", "destination": "/docs/cookbook/:rest*", "type": 301 },
       { "source": "/custom-fonts", "destination": "/docs/cookbook/design/fonts", "type": 301 },
       { "source": "/debugging", "destination": "/docs/testing/debugging", "type": 301 },
-      { "source": "/design-principles", "destination": "/docs/resources/design-principles", "type": 301 },
+      { "source": "/design-principles", "destination": "https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo", "type": 301 },
       { "source": "/developing-packages", "destination": "/docs/development/packages-and-plugins/developing-packages", "type": 301 },
       { "source": "/faq", "destination": "/docs/resources/faq", "type": 301 },
       { "source": "/fastlane-cd", "destination": "/docs/deployment/fastlane-cd", "type": 301 },

src/_data/sidenav.yml

@@ -176,8 +176,6 @@
       permalink: /docs/resources/inside-flutter
     - title: Technical overview
       permalink: /docs/resources/technical-overview
-    - title: Development philosophy
-      permalink: /docs/resources/design-principles
     # - title: Flutter best practices # TODO
     - title: Technical videos for learning Flutter
       permalink: /docs/resources/videos