Use SVG icons from global symbols

Allow to change color and avoid code duplication

src/routes/__layout.svelte

@@ -4,6 +4,7 @@
     import { setContext } from 'svelte'
     import '$utils/polyfills'
     // Components
+    import SVGSprite from '$components/SVGSprite.svelte'
     import Switcher from '$components/molecules/Switcher.svelte'
     import Footer from '$components/organisms/Footer.svelte'
 
@@ -25,6 +26,8 @@
     <Footer />
 {/if}
 
+<SVGSprite />
+
 <script context="module" lang="ts">
     import { fetchAPI } from '$utils/api'