Fjord Theme compatible with 7.1

• Type: Story
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: 7.1.X, Master
• Component/s: Themes > Fjord
• Labels: None
• Epic Link: Productive Modular Frontend
• Sprint: S01E10 - The Terminator
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/57236

Modify the Fjord Theme to make it compatible with 7.1 version. 

The final result of this story is the updated CSS for the 7.1 BS4 and Clay layers. All the theme content will be removed, pending a deeper evaluation on how to better leverage the new Modern Site Building APIs