feat: add Fibrous public repos

[0xKermo]

[Please describe your pull request here]

Checklist

• The URL is not already present in the list (check with CTRL/CMD+F in the
  raw markdown file).
• Each description starts with an uppercase character and ends with a
  period.
  Example: cairo - The Cairo programming language.
• Drop all A / An prefixes at the start of the description.
• Avoid using the word Starknet in the description.