Update chaoshub.md

[devkumar2313]

What this PR does / why we need it:
This PR adds a missing step in the ChaosHub documentation to improve the user experience when connecting Git repositories. The documentation was missing a crucial step that explains how to enter security keys (Access Token or SSH Key) after connecting a public or private Git repository. This addition provides better clarity and guidance for users setting up authentication with their Git repositories.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #356

Special notes for your reviewer:

• Added a new step "2. Enter your security key" after the existing step "1. Connect a public and private Git repository"
• Reorganized existing content about Access Token and SSH Key under the new step 2 as subsections
• Maintained all existing content and formatting
• Added contextual information explaining when authentication credentials are needed
• No breaking changes to existing documentation structure

Checklist:

• Fixes Add “Enter your security key” step in Chaoshub docs #356
• Signed the commit for DCO to be passed
• Labelled this PR & related issue with documentation tag

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