Update branding and links

[discdiver]

Closes

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Screenshots

Checklist

• [ ] References any related issue by including "Closes #" or "Closes ".
  • If no issue exists and your change is not a small fix, please create an issue first.
• [X] Includes tests or only affects documentation.
• [ ] Passes pre-commit checks.
  • Run pre-commit install && pre-commit run --all locally for formatting and linting.
• [ ] Includes screenshots of documentation updates.
  • Run mkdocs serve view documentation locally.
• [ ] Summarizes PR's changes in CHANGELOG.md