docs(readme): update Fosshost.org logo location

Created by: szemek

Description

• in README.md replace https://fosshost.org/img/FosshostLogo.png with https://fosshost.org/img/fosshost-logo.png as previous location no longer exists (page returns 404 error)

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation
• Chore (Related to CI or Packaging to platforms)