Add sidebar navigation and global command search

src/routes/betas/new/+page.svelte

@@ -1,7 +1,6 @@
 <script lang="ts">
     import { page } from '$app/stores';
     import { contextHref, safeReturnHref } from '$lib/navigation-context.js';
-    import BackLink from '$ui/components/BackLink.svelte';
     import Breadcrumbs from '$ui/components/primitives/Breadcrumbs.svelte';
     import { timeFormat } from '$ui/stores/time-zone.js';
     import { onMount, tick } from 'svelte';
@@ -202,7 +201,6 @@
 <svelte:head><title>New beta | Electric Cherry</title></svelte:head>
 <div class="page">
     <Breadcrumbs items={[{ label: 'Betas', href: '/betas' }, { label: 'New beta' }]} />
-    <BackLink fallback="/betas" />
     <SectionHeader title="New beta" subtitle="Test files across games in one beta. Choose one instance count for every game." />
     {#if flash}<div class="ui-error" role="alert">{flash}{#if !scripts.length}<Button size="sm" onclick={()=>initialize()}>Retry</Button>{/if}</div>{/if}
     {#if $fleetError}<div class="ui-error" role="alert">{$fleetError}<Button size="sm" onclick={() => refreshFleet(true)}>Retry servers</Button></div>{/if}