Add Wellfound job board scraper support and update documentation

[Vivek02Sharma]

Description

This PR adds native support for scraping startup job postings from Wellfound (formerly AngelList Talent), expanding JobSpy's supported platforms.

Closes #378

Core Changes:

• Wellfound Scraper Integration (jobspy/wellfound/):
  • Added WellfoundScraper that bypasses DataDome anti-bot protection using curl_cffi for Chrome TLS impersonation.
  • Parses highly structured data (compensation, remote policy) directly from Wellfound's Apollo GraphQL cache instead of fragile HTML parsing.
  • Implements round-robin proxy rotation and a tokenized keyword search engine.
• Library Updates (jobspy/):
  • Registered Site.WELLFOUND in the main scraper mapping and enum.
  • Added WellfoundException for precise error handling.
• Documentation (README.md):
  • Added Wellfound to the list of supported boards.
  • Added FAQ guidance on bypassing 403 DataDome errors via proxies.

Testing:

• Passed pre-commit and black formatting checks.
• Locally verified successful extraction of 200+ jobs sequentially into the standard JobPost schema.

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