Deep-link enabled

• Enable deep-links
• Implement a fallback redirecting to the domain mobile.minds.com (Needs backend changes)
• Reimplement single post screen to have the new full-screen design.
• Fix image objects entities are not showing text (Links contain the GUID of the image instead of the post)
• Fix spec tests

⚠ this MR requires the mobile.minds.com subdomain to work without redirecting to www.minds.com