docs: 0.114.0 release notes, navigation restructure, new guides, deploy video, and cleanup (#2653)

- Add v0.114.0 release notes with highlights image and doc links
- Restructure docs navigation (Strategy group, Releases tab, navbar links)
- Update quickstart with deployment video and clearer instructions
- Add/rename guides (Custom Manager Agent, Custom LLM)
- Remove legacy concept/tool docs
- Add new images and tool docs
- Minor formatting and content improvements throughout

docs/tools/langchaintool.mdx

@@ -0,0 +1,58 @@
+---
+title: LangChain Tool
+description: The `LangChainTool` is a wrapper for LangChain tools and query engines.
+icon: link
+---
+
+## `LangChainTool`
+
+<Info>
+    CrewAI seamlessly integrates with LangChain's comprehensive [list of tools](https://python.langchain.com/docs/integrations/tools/), all of which can be used with CrewAI.
+</Info>
+
+```python Code
+import os
+from dotenv import load_dotenv
+from crewai import Agent, Task, Crew
+from crewai.tools import BaseTool
+from pydantic import Field
+from langchain_community.utilities import GoogleSerperAPIWrapper
+
+# Set up your SERPER_API_KEY key in an .env file, eg:
+# SERPER_API_KEY=<your api key>
+load_dotenv()
+
+search = GoogleSerperAPIWrapper()
+
+class SearchTool(BaseTool):
+    name: str = "Search"
+    description: str = "Useful for search-based queries. Use this to find current information about markets, companies, and trends."
+    search: GoogleSerperAPIWrapper = Field(default_factory=GoogleSerperAPIWrapper)
+
+    def _run(self, query: str) -> str:
+        """Execute the search query and return results"""
+        try:
+            return self.search.run(query)
+        except Exception as e:
+            return f"Error performing search: {str(e)}"
+
+# Create Agents
+researcher = Agent(
+    role='Research Analyst',
+    goal='Gather current market data and trends',
+    backstory="""You are an expert research analyst with years of experience in
+    gathering market intelligence. You're known for your ability to find
+    relevant and up-to-date market information and present it in a clear,
+    actionable format.""",
+    tools=[SearchTool()],
+    verbose=True
+)
+
+# rest of the code ...
+```
+
+## Conclusion
+
+Tools are pivotal in extending the capabilities of CrewAI agents, enabling them to undertake a broad spectrum of tasks and collaborate effectively.
+When building solutions with CrewAI, leverage both custom and existing tools to empower your agents and enhance the AI ecosystem. Consider utilizing error handling, caching mechanisms,
+and the flexibility of tool arguments to optimize your agents' performance and capabilities.