Update Display
Rename some specs to "Level 1" and move

Now CSS Level of "Exclusions and Shapes", "Regions",
"Custom Properties for Cascading Variables Level 1", "Mobile Text Size Adjustment" are 1.
Update and Split "Exclusions and Shapes Level 1"

Now this spec separates into "Exclusions Level 1" and "Shapes Level 1".
Fix Spec Link Generator
Update "Regions Level 1"
Update "Media Queries"
Update "Writing Modes"