feat: use mdBook for documentation (#10)

docs/sensor/custom_panel.md

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+# Custom Panels
+
+By default, the defined panels in the main configuration file are loaded and rendered.
+
+Additional custom panels can be included with the `--panels` command line parameter.
+
+A custom panel consists of:
+- a `panel.json` file with just the json object of the `diy` array of the main configuration file.
+- `img` subdirectory containing the referenced images in `panel.json`
+- `fonts` subdirectory containing the referenced fonts in `panel.json`
+
+Example:
+```
+.
+├── fonts
+│   ├── HarmonyOS_Sans_SC_Bold.ttf
+│   └── ROGFontsv.ttf
+├── img
+│   ├── 6ae90fde-d0a1-44ec-9e15-7b6af14e3b7b.jpg
+│   ├── 95f38f70-9e0c-4b54-80a9-6bd7b0b4475c_1744449208_1746941971.png
+│   ├── f1c3d74c-0157-4b77-82a6-f07e565fe439_1744447224_1746941971.png
+│   └── f5d534e5-4527-4ca0-a0e9-69e8eef86f62_1744447151_1746941971.png
+└── panel.json
+```
+
+There are lots of custom panel configurations available online.
+AOOSTAR support sent the following link: <http://pan.sztbkj.com:5244/>, look for a file called [`有线网卡 windows驱动.rar`](http://pan.sztbkj.com:5244/WTR%20MAX%206+5%E7%9B%98%E4%BD%8D/%E9%A9%B1%E5%8A%A8/%E6%9C%89%E7%BA%BF%E7%BD%91%E5%8D%A1%20windows%E9%A9%B1%E5%8A%A8.rar)
+in the `WTR MAX 6+5盘位/驱动/` subfolder.
+
+Example:
+```shell
+asterctl --config monitor.json --panels cfg/01_custom --panels cfg/02_custom
+```