Prerelease bug fixes and improvements

[junron]

Improvements

• Add indication that user should scroll down on the landing page
• Add popup to show link info after link creation
• Inform user that the creator of a link will be logged
• Add page to show links a user has created
• Add appropriate icon

Bug fixes

• Add HSTS (infra)
• Add CSS transition for header font-size
• Fix footer hiding content
• Remove menu (for now)