feat: show call participants in room list (Discord-style)

docs/icons.md

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+# Icons
+
+Icons are loaded using [@svgr/webpack](https://www.npmjs.com/package/@svgr/webpack).
+This is configured in [element-web](https://github.com/vector-im/element-web/blob/develop/webpack.config.js#L458).
+
+Each `.svg` exports a `ReactComponent` at the named export `Icon`.
+Icons have `role="presentation"` and `aria-hidden` automatically applied. These can be overriden by passing props to the icon component.
+
+SVG file recommendations:
+
+- Colours should not be defined absolutely. Use `currentColor` instead.
+- SVG files should be taken from the design compound as they are. Some icons contain special padding.
+  This means that there should be icons for each size, e.g. warning-16px and warning-32px.
+
+Example usage:
+
+```
+import { Icon as FavoriteIcon } from 'res/img/element-icons/favorite.svg';
+
+const MyComponent = () => {
+    return <>
+        <FavoriteIcon className="mx_Icon mx_Icon_16">
+    </>;
+}
+```
+
+If possible, use the icon classes from [here](https://github.com/element-hq/element-web/blob/develop/apps/web/res/css/compound/_Icon.pcss).
+
+## Custom styling
+
+Icon components are svg elements and may be custom styled as usual.
+
+`_MyComponents.pcss`:
+
+```css
+.mx_MyComponent-icon {
+    height: 20px;
+    width: 20px;
+
+    * {
+        fill: $accent;
+    }
+}
+```
+
+`MyComponent.tsx`:
+
+```typescript
+import { Icon as FavoriteIcon } from 'res/img/element-icons/favorite.svg';
+
+const MyComponent = () => {
+    return <>
+        <FavoriteIcon className="mx_MyComponent-icon" role="img" aria-hidden="false">
+    </>;
+}
+```