Setup material documentation

website/docs/advanced/_category_.json

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 {
   "label": "Advanced",
-  "position": 4,
+  "position": 5,
   "link": {
     "type": "generated-index"
   }

website/docs/material/_category_.json

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+{
+  "label": "Material",
+  "position": 4,
+  "link": {
+    "type": "generated-index"
+  }
+}

website/docs/material/base-color.md

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+---
+sidebar_position: 1
+---
+
+import TracerExperiment from "@site/src/components/TracerExperiment";
+
+# Base Color
+
+<TracerExperiment />

website/docs/material/index.md

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+---
+sidebar_position: 0
+---
+
+# Intro Material
+
+`strahl` leverages the [OpenPBR surface shading model](https://github.com/AcademySoftwareFoundation/OpenPBR) to achieve physically-based rendering.
+
+## What is Physically-based Rendering?
+
+Physically-based rendering, or short PBR, is an approach that seeks to render models in a way that resembles physical laws of reality.
+
+## Material Definition
+
+These tutorials establish an understanding of the parameters available to adjust the material appearance.