Add clearer initial documentation

docs/getting-started/_category_.json

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+{
+	"label": "Getting Started",
+	"position": 1
+}

docs/getting-started/install.md

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+---
+sidebar_position: 2
+---
+
+# Installation
+
+## [libstardustxr](https://github.com/StardustXR/libstardustxr) (server, client, and fusion)
+
+### Prerequisites
+1. Meson
+2. Ninja
+3. Flatbuffers >= 1.12.0
+
+### Download
+```bash
+git clone https://github.com/StardustXR/libstardustxr.git
+cd libstardustxr
+```
+
+### Build
+```bash
+meson build --prefix=/usr
+cd build
+ninja
+```
+
+### Install
+```bash
+ninja install
+```
+
+## [stardust-xr](https://github.com/StardustXR/stardust-xr) (reference server)
+
+### Prerequisites
+1. Meson >= 0.55.0
+2. Ninja
+3. CMake
+4. Flatbuffers >= 1.12.0
+5. EGL+GLES 3.2
+6. GLX+Xlib
+7. fontconfig
+8. dlopen
+9. OpenXR Loader (required even if run in flatscreen mode)
+
+### Download
+```bash
+git clone https://github.com/StardustXR/stardust-xr.git
+cd stardust-xr
+```
+
+### Build
+```bash
+meson build --prefix=/usr
+cd build
+ninja
+```
+
+### Install
+```bash
+ninja install
+```

docs/getting-started/run.md

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+---
+sidebar_position: 3
+---
+
+# Use
+
+## Server
+```
+Stardust XR
+Usage: stardustxr [OPTIONS]
+
+Options:
+  -h,--help                   Print this help message and exit
+  -F,--flatscreen             Run Stardust in flatscreen mode
+  --field-debug               Draw translucent meshes around fields
+  ```