Bump version to v2022.6.8

• Config: Use 'TU Wien Research Data' as the default config value. The previous one isn't valid anymore.
• Footer: Add 2 extra logos with their respective links
• Footer: Apply styling
• Add static images: Use webp format and png format to have a reference for the original images
• Add an extra route for terms of use, instead of the external pdf link
• Update pdf links: use external links, instead of serving them locally