Migrate docs from MkDocs to Mintlify (#1423)

* add new mintlify docs

* add favicon.svg

* minor edits

* add github stats

docs/introduction.mdx

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+---
+title: Introduction
+description: Welcome to CrewAI docs!
+icon: handshake
+---
+
+# What is CrewAI?
+
+**CrewAI is a cutting-edge Python framework for orchestrating role-playing, autonomous AI agents.**
+
+By fostering collaborative intelligence, CrewAI empowers agents to work together seamlessly, tackling complex tasks.
+
+<Frame caption="CrewAI Mindmap">
+  <img src="crewAI-mindmap.png" alt="CrewAI Mindmap" />
+</Frame>  
+
+## Why CrewAI?
+- 🤼‍♀️ **Role-Playing Agents**: Agents can take on different roles and personas to better understand and interact with complex systems.
+- 🤖 **Autonomous Decision Making**: Agents can make decisions autonomously based on the given context and available tools.
+- 🤝 **Seamless Collaboration**: Agents can work together seamlessly, sharing information and resources to achieve common goals.
+- 🧠 **Complex Task Tackling**: CrewAI is designed to tackle complex tasks, such as multi-step workflows, decision making, and problem solving.
+
+# Get Started with CrewAI
+
+<CardGroup cols={2}>
+  <Card
+  title="Quickstart"
+  color="#F3A78B"
+  href="quickstart"
+  icon="terminal"
+    iconType="solid"
+  >
+    Getting started with CrewAI 
+  </Card>
+  <Card
+    title="Join the Community"
+    color="#F3A78B"
+    href="https://community.crewai.com"
+    icon="comment-question"
+      iconType="duotone"
+    >
+      Join the CrewAI community and get help with your project!
+    </Card>
+</CardGroup>
+
+## Next Step
+
+- [Install CrewAI](/installation)
+