Add Project Switcher Bar integration and remove ServerSideUp component

- Added dependency for @serversideup/project-switcher-bar in package.json and yarn.lock.
- Replaced ServerSideUp component with ProjectSwitcherBar in app.vue.
- Updated CSS to include styles from the new Project Switcher Bar.
- Removed the ServerSideUp component as it is no longer needed.

Author: jaydrogers

docs/app/app.vue

@@ -2,7 +2,7 @@
     <UApp>
         <NuxtLoadingIndicator />
 
-        <ServerSideUp/>
+        <ProjectSwitcherBar />
 
         <UBanner 
             icon="i-lucide-zap" 
@@ -33,6 +33,8 @@
 </template>
 
 <script setup lang="ts">
+import { ProjectSwitcherBar } from '@serversideup/project-switcher-bar'
+
 const { seo } = useAppConfig()
 
 const { data: navigation } = await useAsyncData('navigation', () => queryCollectionNavigation('docs'))

docs/app/assets/css/main.css

@@ -2,6 +2,7 @@
 @import "@nuxt/ui";
 
 @source "../../../content/**/*";
+@source "../../../node_modules/@serversideup/project-switcher-bar/src";
 
 @theme {
   --color-mode: 'dark';