Updated Authentication and Join the Protocol Pages #103

[harishkotra]

Made changes to the following pages:

• Change the Authentication page (https://docs.gaianet.ai/getting-started/authentication) to Get your API key to make it easier for developers to find the tutorial.
• Updated the Join the Protocol page (https://docs.gaianet.ai/getting-started/register) with gaia.domains information that was missing during v1 to v2 transition.

[juntao]

Hello, I am a PR summary agent on flows.network. Here are my reviews of code commits in this PR.

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Commit 0c64f3166e3cf4ef2eac8ae9ea127ca31d650401

Key Changes Summary

1. Renamed and Simplified authentication.md:

   • Renamed section from "API Keys" to "Get your API key".
   • Removed redundant headers.

2. Comprehensive Update of register.md:

   • Added detailed steps on how to join a Gaia Domain.
   • Included instructions for joining domains from both the node management page and the AI Agent Domains page.
   • Provided command-line examples for changing node domain configurations.
   • Added screenshots illustrating the process.
   • Included important notes about compliance with domain rules.

Most Important Findings

• Updated Authentication Page: Simplified the title to focus on obtaining an API key.
• Enhanced Join Process Documentation: Added comprehensive, step-by-step guides and visual aids for joining Gaia Domains.