remove tech radar icon from frontend due to removal of tech-radar plugin

Signed-off-by: Dave Ashby <dave.ashby@potomacsi.com>

.changeset/strange-flowers-burn.md

@@ -0,0 +1,5 @@
+---
+'@backstage/create-app': patch
+---
+
+Remove Tech-Radar menu from scaffolded app sidebar to align with backend removal of tech-radar plugin.

packages/create-app/templates/default-app/packages/app/src/components/Root/Root.tsx

@@ -72,7 +72,6 @@ export const Root = ({ children }: PropsWithChildren<{}>) => (
         {/* End global nav */}
         <SidebarDivider />
         <SidebarScrollWrapper>
-          <SidebarItem icon={MapIcon} to="tech-radar" text="Tech Radar" />
         </SidebarScrollWrapper>
       </SidebarGroup>
       <SidebarSpace />