AI Check-In: landing page layout (#59) - #63

Changed pages include:

• index.html - view
• 404.html - view
• ai-at-work.html - view
• da.html - view
• de.html - view
• en.html - view
• es.html - view
• fr.html - view
• he.html - view
• hu.html - view

There are more changes not included in the list