Serve static files at root; add ColorPicker README

- Change FileServer base path to “/” to serve static assets from the
  site root.
- Remove the unused helloHandler route registration.
- Add README documentation for the new ColorPicker web component.

static/components/color-picker/README.md

@@ -0,0 +1,41 @@
+# ColorPicker Component
+
+## Overview
+`ColorPicker` is a custom HTML web component that provides a simple UI for selecting a background color.  
+The component renders a native `<input type="color">` element and forwards the chosen color via a custom
+`colorchange` event.
+
+## Usage
+```html
+<script type="module" src="/static/components/color-picker/color-picker.js"></script>
+
+<color-picker></color-picker>
+```
+
+## API
+| Attribute / Property | Type   | Description                                   |
+|----------------------|--------|-----------------------------------------------|
+| `value` (attr)      | string | Hex color string (e.g., `#ff0000`). Default is `#ffffff`. |
+| `value` (prop)      | string | Same as above, but as a JavaScript property. |
+
+### Events
+| Event       | Detail                     | Description |
+|-------------|----------------------------|-------------|
+| `colorchange` | `{color: string}` (hex)   | Fired whenever the user selects a new color. |
+
+## Example
+```html
+<color-picker id="bgPicker"></color-picker>
+
+<script>
+  const picker = document.getElementById('bgPicker');
+  picker.addEventListener('colorchange', e => {
+    console.log('Background color selected:', e.detail.color);
+  });
+</script>
+```
+
+## Change Log
+| Date       | Author | Change |
+|------------|--------|--------|
+| 2026‑01‑11 | Thomas | Initial component documentation. |