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

i18n/translations/en-US/common.json

@@ -0,0 +1,6 @@
+{
+  "en-US": "English",
+  "fr-FR": "French",
+  "all-rights-reserved": "All rights reserved",
+  "home": "Home"
+}

i18n/translations/en-US/errors.json

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+{
+  "return-to-home-page": "Return to the home page?",
+  "error": "Error",
+  "server-error": "Internal Server Error!",
+  "not-found": "This page doesn't exist!"
+}

i18n/translations/en-US/home.json

@@ -0,0 +1,59 @@
+{
+  "about": {
+    "description": "Developer Full Stack • Open-Source enthusiast",
+    "pronouns": "Pronouns",
+    "pronouns-value": "He/Him",
+    "birth-date": "Birth date",
+    "years-old": "years old",
+    "nationality": "Nationality",
+    "description-bottom": "I am a student in computer science following the French training \"BUT Informatique\" and I am also a self-taught."
+  },
+  "interests": {
+    "title": "Interests",
+    "paragraphs": [
+      {
+        "title": "Developer Full Stack",
+        "description": "Computer programming is my main hobby, I love it! <br/> Mostly web development for the moment but I'm programming in others programming language too."
+      },
+      {
+        "title": "Open-Source enthusiast",
+        "description": "For me, everyone should work, solve problems, build things and think together.<br/> The website is open-source on <a class='text-yellow dark:text-yellow-dark hover:underline' href='https://github.com/theoludwig/theoludwig' target='_blank' rel='noopener noreferrer'>GitHub</a>."
+      },
+      {
+        "title": "Passionate about High-Tech",
+        "description": "I always wondered how the future would be. Every day I want to wake up and think that the future will be great and better than the past. Technologies improve gradually over time, which is very useful in many areas."
+      }
+    ]
+  },
+  "skills": {
+    "title": "Skills",
+    "languages": "Programming languages",
+    "software-tools": "Software and tools"
+  },
+  "portfolio": {
+    "title": "Portfolio",
+    "items": [
+      {
+        "title": "Carolo",
+        "description": "Strategy board game similar to chess which allows grandiose moves (only available in French).",
+        "link": "https://carolo.theoludwig.fr/",
+        "image": "/images/portfolio/Carolo.png"
+      },
+      {
+        "title": "Thream",
+        "description": "Your open source platform to stay close with your friends and communities, talk, chat, collaborate, share and have fun.",
+        "link": "https://thream.theoludwig.fr/",
+        "image": "/images/portfolio/Thream.png"
+      },
+      {
+        "title": "Leon",
+        "description": "Leon is your open-source personal assistant.",
+        "link": "https://getleon.ai/",
+        "image": "/images/portfolio/Leon.png"
+      }
+    ]
+  },
+  "open-source": {
+    "description": "List of most famous open source projects I contributed to."
+  }
+}