⚠️ Rework completely how transitions works

- Use Svelte/Sapper native if and transitions to show either the page content or the loader, then load each page animationIn
- Code is safe on SSR side, using process.browser on this if
- The <main> element is on position absolute to fade nicely the different pages
- Code cleaning

src/atoms/TitleSite.svelte

@@ -6,28 +6,30 @@
     import { animateIn } from 'animations/TitleSite'
 
     // Props and variables
-    export let init = false
-    let scope
     let mounted = false
+    let scope
 
 
     /*
-    ** Run code on component mount
+    ** Run code when mounted
     */
     onMount(() => {
-        animateIn(scope, init)
+        animateIn(scope)
         mounted = true
     })
 </script>
 
-<div class="title-location title-location--inline" bind:this={scope} style="opacity: {mounted ? 1 : 0}">
+<div class="title-location title-location--inline"
+    bind:this={scope}
+    style="opacity: {mounted ? 1 : 0}"
+>
     <div role="heading" aria-level="1" aria-label="Houses">
         <div class="anim-mask">
             {@html charsToSpan('Houses')}
         </div>
     </div>
 
-    <em>
+    <em class="anim-mask">
         <span>of</span>
         <span>the</span>
     </em>