⚠️ 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/organisms/Carousel.svelte

@@ -3,6 +3,8 @@
     import { stores } from '@sapper/app'
     import { currentLocation, fullscreen } from 'utils/store'
     import { getThumbnail, formatDate } from 'utils/functions'
+    const dispatch = createEventDispatcher()
+    const { page } = stores()
 
     // Dependencies
     import SwipeListener from 'swipe-listener'
@@ -15,13 +17,9 @@
     import Counter from 'atoms/Counter'
     import PaginationDots from 'molecules/PaginationDots'
 
-    // Props
+    // Props and Variables
     export let photos
     export let viewer = false
-
-    // Variables
-    const dispatch = createEventDispatcher()
-    const { page } = stores()
     let scope
     let swiped
     let currentIndex = 0