[docs] Make platforms optional parameter (#3992)

## Description

This PR does 2 things:

- Removes old `HeaderWithBadge` component, which was replaced by
`HeaderWithBadges`
- Makes `platforms` prop optional, so it is possible to add only version
badge.

> [!NOTE]
> `HeaderWithBadges` already treats `platforms` as optional with
[optional
chaining](https://github.com/software-mansion/react-native-gesture-handler/blob/554e66821e382c34c9187cc633a4f55f57c8d533/packages/docs-gesture-handler/src/components/HeaderWithBadges/index.tsx#L79).

## Test plan

Read docs 🤓

Author: m-bert

packages/docs-gesture-handler/src/components/HeaderWithBadge/index.tsx

@@ -5,7 +5,7 @@ import styles from './styles.module.css';
 import clsx from 'clsx';
 
 type HeaderWithBadgesProps = {
-  platforms: string[];
+  platforms?: string[];
   version?: string;
   children?: React.ReactNode;
 };