docs: remove unnecessary thing

site/content/tutorial/16-special-elements/02-svelte-component/app-a/App.svelte

@@ -1,12 +1,10 @@
 <script>
 	import RedThing from './RedThing.svelte';
 	import GreenThing from './GreenThing.svelte';
-	import BlueThing from './BlueThing.svelte';
 
 	const options = [
 		{ color: 'red',   component: RedThing   },
 		{ color: 'green', component: GreenThing },
-		{ color: 'blue',  component: BlueThing  },
 	];
 
 	let selected = options[0];
@@ -22,6 +20,4 @@
 	<RedThing/>
 {:else if selected.color === 'green'}
 	<GreenThing/>
-{:else if selected.color === 'blue'}
-	<BlueThing/>
 {/if}

site/content/tutorial/16-special-elements/02-svelte-component/app-a/BlueThing.svelte

@@ -1,7 +0,0 @@
-<strong>Blue thing</strong>
-
-<style>
-	strong {
-		color: blue;
-	}
-</style>

site/content/tutorial/16-special-elements/02-svelte-component/app-b/App.svelte

@@ -1,12 +1,10 @@
 <script>
 	import RedThing from './RedThing.svelte';
 	import GreenThing from './GreenThing.svelte';
-	import BlueThing from './BlueThing.svelte';
 
 	const options = [
 		{ color: 'red',   component: RedThing   },
 		{ color: 'green', component: GreenThing },
-		{ color: 'blue',  component: BlueThing  },
 	];
 
 	let selected = options[0];

site/content/tutorial/16-special-elements/02-svelte-component/app-b/BlueThing.svelte

@@ -1,7 +0,0 @@
-<strong>Blue thing</strong>
-
-<style>
-	strong {
-		color: blue;
-	}
-</style>

site/content/tutorial/16-special-elements/02-svelte-component/text.md

@@ -9,8 +9,6 @@ A component can change its category altogether with `<svelte:component>`. Instea
 	<RedThing/>
 {:else if selected.color === 'green'}
 	<GreenThing/>
-{:else if selected.color === 'blue'}
-	<BlueThing/>
 {/if}
 ```