Remove LandingPage since it is not used anymore

gui/packages/ubuntupro/lib/pages/widgets/page_widgets.dart

@@ -69,107 +69,6 @@ class Pro4WSLPage extends StatelessWidget {
   }
 }
 
-// A more stylized page that mimics the design of the https://ubuntu.com/pro
-// landing page, with a dark background and an [svgAsset] logo followed by
-// a title with some opacity, rendering the [children] in a column layout.
-class LandingPage extends StatelessWidget {
-  const LandingPage({
-    super.key,
-    required this.children,
-    this.svgAsset = 'assets/Ubuntu-tag.svg',
-    this.title = 'Ubuntu Pro',
-    this.centered = false,
-  });
-  final List<Widget> children;
-  final String svgAsset;
-  final String title;
-  final bool centered;
-
-  @override
-  Widget build(BuildContext context) {
-    final theme = Theme.of(context);
-
-    return Pro4WSLPage(
-      body: Padding(
-        padding: const EdgeInsets.fromLTRB(32.0, 32.0, 32.0, 8.0),
-        child: centered
-            ? Center(
-                child: ConstrainedBox(
-                  constraints: const BoxConstraints(maxWidth: 480.0),
-                  child: _PageContent(
-                    svgAsset: svgAsset,
-                    title: title,
-                    data: theme,
-                    centered: true,
-                    children: children,
-                  ),
-                ),
-              )
-            : _PageContent(
-                svgAsset: svgAsset,
-                title: title,
-                data: theme,
-                children: children,
-              ),
-      ),
-    );
-  }
-}
-
-class _PageContent extends StatelessWidget {
-  const _PageContent({
-    required this.svgAsset,
-    required this.title,
-    required ThemeData data,
-    required this.children,
-    this.centered = false,
-  }) : _data = data;
-
-  final String svgAsset;
-  final String title;
-  final ThemeData _data;
-  final List<Widget> children;
-  final bool centered;
-
-  @override
-  Widget build(BuildContext context) {
-    return Column(
-      crossAxisAlignment:
-          centered ? CrossAxisAlignment.center : CrossAxisAlignment.start,
-      mainAxisAlignment:
-          centered ? MainAxisAlignment.center : MainAxisAlignment.start,
-      children: [
-        RichText(
-          text: TextSpan(
-            children: [
-              WidgetSpan(
-                child: SvgPicture.asset(
-                  svgAsset,
-                  height: 70,
-                ),
-              ),
-              const WidgetSpan(
-                child: SizedBox(
-                  width: 8,
-                ),
-              ),
-              TextSpan(
-                text: title,
-                style: _data.textTheme.displaySmall
-                    ?.copyWith(fontWeight: FontWeight.w100),
-              ),
-            ],
-          ),
-        ),
-        const SizedBox(
-          height: 12,
-        ),
-        ...children,
-      ],
-    );
-  }
-}
-
 class CenteredPage extends StatelessWidget {
   const CenteredPage({
     super.key,