Format version 3.0

[regseb]

• Simplify links:
  • Replace redirections.
  • Use <https://example.com/> when label and link are identical [https://example.com/](https://example.com/) (to avoid inconsistencies).
• Format with Prettier:
  • npx prettier --write --prose-wrap always content/version/3/0/code_of_conduct.md
  • Use --prose-wrap to force line length to 80 (recommended in Print Width option).

[regseb]

@CoralineAda I applied your suggestions.