feat: json descriptions of examples with multi-lingual support

src/examples/brdfs/01_lambert/example.json

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+{
+  "slug": "brdf_lambertian",
+  "en": {
+    "name": "Lambertian Diffuse BRDF",
+    "description": "",
+    "keywords": [ "brdf", "lambert", "lambertian", "diffuse" ]
+  }
+}

src/examples/brdfs/02_specular/example.json

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+{
+  "slug": "brdf_specular_ggx",
+  "en": {
+    "name": "GGX Specular BRDF",
+    "description": "",
+    "keywords": [ "brdf", "specular", "ggx", "reflection" ]
+  }
+}

src/examples/brdfs/03_specularAnisotropic/example.json

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+{
+  "slug": "brdf_specular_ggx_anisotropic",
+  "en": {
+    "name": "GGX Specular Anisotropic BRDF",
+    "description": "",
+    "keywords": [ "brdf", "specular", "ggx", "reflection", "anisotropic" ]
+  }
+}

src/examples/brdfs/04_normals/example.json

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+{
+  "slug": "microgeometry_normals",
+  "en": {
+    "name": "Normal Map Microgeometry",
+    "description": "",
+    "keywords": [ "microgeometry", "normal", "map", "perturbation", "mapping" ]
+  }
+}

src/examples/brdfs/05_bump/example.json

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+{
+  "slug": "microgeometry_bump",
+  "en": {
+    "name": "Bump Map Microgeometry",
+    "description": "",
+    "keywords": [ "microgeometry", "bump", "map", "perturbation", "mapping" ]
+  }
+}

src/examples/brdfs/06_clearcoat/example.json

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+{
+  "slug": "brdf_clear_coat_specular",
+  "en": {
+    "name": "Clear Coat Specular BRDF",
+    "description": "",
+    "keywords": [ "brdf", "specular", "clearcoat", "reflection" ]
+  }
+}

src/examples/brdfs/07_sheen/example.json

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+{
+  "slug": "brdf_sheen",
+  "en": {
+    "name": "Sheen BRDF",
+    "description": "",
+    "keywords": [ "brdf", "sheen", "fabric", "cloth" ]
+  }
+}

src/examples/brdfs/08_displacement/example.json

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+{
+  "slug": "microgeometry_displacement",
+  "en": {
+    "name": "Displacement Map Microgeometry",
+    "description": "",
+    "keywords": [ "microgeometry", "displacement", "map", "perturbation", "mapping" ]
+  }
+}

src/examples/brdfs/09_normals2/example.json

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+{
+  "slug": "microgeometry_normals_reference",
+  "en": {
+    "name": "Normal Map Microgeometry Reference",
+    "description": "",
+    "keywords": [ "microgeometry", "normal", "map", "perturbation", "mapping", "reference" ]
+  }
+}