feat: rewrite to Next.js v13 app directory

Improvements:
- Hide switch theme input (ugly little white square)
- i18n without subpath (e.g: /fr or /en), same url whatever the locale used

components/Loader/Loader.module.css

@@ -0,0 +1,39 @@
+@keyframes progressSpinnerRotate {
+  100% {
+    transform: rotate(360deg);
+  }
+}
+@keyframes progressSpinnerDash {
+  0% {
+    stroke-dasharray: 1, 200;
+    stroke-dashoffset: 0;
+  }
+  50% {
+    stroke-dasharray: 89, 200;
+    stroke-dashoffset: -35px;
+  }
+  100% {
+    stroke-dasharray: 89, 200;
+    stroke-dashoffset: -124px;
+  }
+}
+
+.progressSpinnerSvg {
+  animation: progressSpinnerRotate 2s linear infinite;
+  height: 100%;
+  transform-origin: center center;
+  width: 100%;
+  position: absolute;
+  top: 0;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  margin: auto;
+}
+.progressSpinnerCircle {
+  stroke-dasharray: 89, 200;
+  stroke-dashoffset: 0;
+  stroke: #ffd800;
+  animation: progressSpinnerDash 1.5s ease-in-out infinite;
+  stroke-linecap: round;
+}

components/Loader/Loader.tsx

@@ -0,0 +1,33 @@
+import styles from './Loader.module.css'
+
+export interface LoaderProps {
+  width?: number
+  height?: number
+  className?: string
+}
+
+export const Loader: React.FC<LoaderProps> = (props) => {
+  const { width = 50, height = 50, className } = props
+
+  return (
+    <div className={className}>
+      <div
+        data-cy='progress-spinner'
+        className='relative mx-auto my-0 before:block before:pt-[100%] before:content-none'
+        style={{ width: `${width}px`, height: `${height}px` }}
+      >
+        <svg className={styles['progressSpinnerSvg']} viewBox='25 25 50 50'>
+          <circle
+            className={styles['progressSpinnerCircle']}
+            cx='50'
+            cy='50'
+            r='20'
+            fill='none'
+            strokeWidth='2'
+            strokeMiterlimit='10'
+          />
+        </svg>
+      </div>
+    </div>
+  )
+}