Add Media & Branding Section

[LukasWallrich]

Create a page for media and branding materials, referencing:

• OSIRIS Media Center (https://osiris4r.eu/media-center/)
• OLS Branding (https://we-are-ols.org/branding.html)
• RDA Communication Kit (https://www.rd-alliance.org/communication-kit/)
  Include logos, press kits, boilerplate text, and design guidelines.

[github-actions]

🤖 Hi @LukasWallrich, I've received your request, and I'm working on it now! You can track my progress in the logs for more details.