docs: Add Tavily Search & Extractor tools to Search-Research suite

[prdai]

This PR expands our Search-Research documentation by introducing two new CrewAI tools powered by Tavily:

1. Tavily Search Tool

   • Comprehensive web-search interface via the Tavily Search API
   • Covers installation, configuration, and usage examples
   • Details on query parameters (depth, topics, time ranges, domain filters, answers, raw content, images)

2. Tavily Extractor Tool

   • Structured content extraction from single or multiple URLs using the Tavily API
   • Controls for extraction depth, image inclusion, and timeouts
   • Full code samples showing basic and advanced extraction workflows

These docs make it straightforward for agents to leverage Tavily’s powerful search and scraping capabilities.

Implementation note: the underlying tool classes (TavilySearchTool & TavilyExtractorTool) are being merged over in the crewAI-tools repo, see PR crewAIInc/crewAI-tools#279. This PR aligns our documentation with that forthcoming implementation.

[tonykipkemboi]

awesome! @Programmer-RD-AI , could you also add the paths to the docs.json file?

also, any chance you could record a loom of the new tools in action.