docs: fix broken link

docs/docs/examples/_category_.json

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+{
+  "label": "Example",
+  "position": 5,
+  "link": {
+    "type": "generated-index",
+    "description": "5 minutes to learn the most important SwiBots concepts."
+  },
+  "collapsed": true
+
+}

docs/docs/examples/echo-bot.md

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+# Creating Your First Bot: Echo Bot
+
+In this example, we'll create a simple echo bot using SwiBots. This bot will respond to any message it receives by sending the same message back to the user.
+
+## Prerequisites
+
+Before you begin, make sure you have:
+
+1. Installed SwiBots (`pip install swibots`)
+2. Obtained a bot token from the Switch platform
+
+## The Code
+
+Here's the complete code for our echo bot:
+
+```python
+from swibots import Client, BotContext, MessageEvent
+
+app = Client("YOUR_BOT_TOKEN")
+
+@app.on_message()
+async def message_handler(ctx: BotContext[MessageEvent]):
+    message = ctx.event.message
+    await message.respond(f"Received: {message.message}")
+
+
+app.run()
+```
+
+## Running the Bot
+
+To run the bot, simply execute the script:
+
+```bash
+python echo_bot.py
+```
+
+## Testing the Bot

docs/docs/fundamentals/_category_.json

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+{
+  "label": "Fundamentals",
+  "position": 3,
+  "link": {
+    "type": "generated-index",
+    "description": "5 minutes to learn the most important SwiBots concepts."
+  },
+  "collapsed": true
+
+}