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

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+{
+  "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

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+{
+  "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."
+  }
+}

i18n/translations/fr-FR/common.json

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+{
+  "en-US": "Anglais",
+  "fr-FR": "Français",
+  "all-rights-reserved": "Tous droits réservés",
+  "home": "Accueil"
+}

i18n/translations/fr-FR/errors.json

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+{
+  "return-to-home-page": "Revenir à la page d'accueil ?",
+  "error": "Erreur",
+  "server-error": "Erreur Interne du Serveur !",
+  "not-found": "Cette page n'existe pas !"
+}

i18n/translations/fr-FR/home.json

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+{
+  "about": {
+    "description": "Développeur Full Stack • Enthousiaste de l'Open-Source",
+    "pronouns": "Pronoms",
+    "pronouns-value": "Il/Lui",
+    "birth-date": "Date de naissance",
+    "years-old": "ans",
+    "nationality": "Nationalité",
+    "description-bottom": "Je suis étudiant à l'université suivant la formation \"BUT Informatique\" et me forme en autodidacte dans l'informatique en suivant des formations en ligne."
+  },
+  "interests": {
+    "title": "Intérêts",
+    "paragraphs": [
+      {
+        "title": "Développeur Full Stack",
+        "description": "La programmation informatique est mon loisir principal, j'adore! <br/> Principalement du développement Web pour le moment, mais je programme aussi dans d'autres langages de programmation."
+      },
+      {
+        "title": "Enthousiaste de l'Open-Source",
+        "description": "Pour moi, tout le monde devrait travailler, résoudre des problèmes, construire des choses et réfléchir ensemble. <br/> Le site est open-source sur <a class='text-yellow dark:text-yellow-dark hover:underline' href='https://github.com/theoludwig/theoludwig' target='_blank' rel='noopener noreferrer'>GitHub</a>."
+      },
+      {
+        "title": "Passionné de High-Tech",
+        "description": "Je me suis toujours demandé comment l'avenir serait. Chaque jour, je veux me réveiller et penser que l'avenir sera formidable et meilleur que le passé. Les technolgies s'améliorent progressivement avec le temps, ce qui est très utile dans de nombreux domaines."
+      }
+    ]
+  },
+  "skills": {
+    "title": "Compétences",
+    "languages": "Langages de programmation",
+    "software-tools": "Logiciels et outils"
+  },
+  "portfolio": {
+    "title": "Portfolio",
+    "items": [
+      {
+        "title": "Carolo",
+        "description": "Jeu de plateau stratégique similaire aux échecs qui permet des coups grandioses, reposant sur des enchaînements remarquables.",
+        "link": "https://carolo.theoludwig.fr/",
+        "image": "/images/portfolio/Carolo.png"
+      },
+      {
+        "title": "Thream",
+        "description": "Votre plateforme open source pour rester proche de vos amis et communautés, parler, discuter, collaborer, partager et amusez-vous.",
+        "link": "https://thream.theoludwig.fr/",
+        "image": "/images/portfolio/Thream.png"
+      },
+      {
+        "title": "Leon",
+        "description": "Leon est votre assistant personnel open source.",
+        "link": "https://getleon.ai/",
+        "image": "/images/portfolio/Leon.png"
+      }
+    ]
+  },
+  "open-source": {
+    "description": "Liste des projets open source les plus célèbres auxquels j'ai contribué."
+  }
+}