feat: Changes to flex and display

- Remove unused flex classes
- Nav module no longer dependend on common flex classes
- Add important to common display and opacity

elements/_grouping.scss

@@ -299,39 +299,6 @@ div {}
 	}
 }
 
-.flex_wrap {
-	@extend .flex;
-	flex-wrap: wrap;
-}
-
-.flex_row {
-	@extend .flex;
-	flex-direction: column;
-	// align-items: flex-start;
-	justify-content: flex-start;
-}
-
-.flex_child {
-	flex: 0 1 auto;
-}
-
-.flex_child_one {
-	flex: 1;
-}
-
-.flex_child_end {
-	align-self: flex-end;
-}
-
-.flex_column_wrap {
-	@extend .flex_wrap;
-
-	.flex_column {
-		@extend .flex_child;
-		flex-grow: 1;
-	}
-}
-
 // Grid
 .grid {
 	display: grid;