Removed references to old products

[filopedraz]

No description provided.

[what-the-diff]

PR Summary

• Updates to 'Welcome' blog post
  The blog post released on June 26, 2023, has been updated. A new section has been added, and another has been removed to keep the information up-to-date and relevant.

• Modifications to 'Perplexity AI Self-Hosted' blog post
  The blog post about our self-hosted Perplexity AI, published on July 1, 2023, has also been updated. A new section is added and an older section is removed for improved clarity and relevance.

• Changes in 'Teach Chatbot With Audio' blog post
  Lastly, the 'Teach Chatbot with Audio' blog post, published on August 3, 2023, has been restructured. A section was added, and another was deleted, making the content more engaging and up-to-date.

• Mention of Developer Platform and AI Startup Grant Program
  In our index.md file, a new paragraph has been added which announces the launch of our new Developer Platform and an exciting Generative AI Startup Grant Program. This includes links to explore the platform and learn more about the grant program, providing easy access to these resources for visitors.