Rename workspace stylesheet and remove unused styles

Author: MetRonnie

src/styles/cylc/_workflow.scss renamed to src/styles/cylc/_workspace.scss

@@ -35,9 +35,6 @@
 
     .lm-BoxPanel {
       flex: 1 1 auto;
-      .lm-TabBar-content {
-        padding-left: 0;
-      }
     }
   }
 }

src/styles/index.scss

@@ -29,7 +29,7 @@
 @use "cylc/table";
 @use "cylc/user_profile";
 @use "cylc/warning";
-@use "cylc/workflow";
+@use "cylc/workspace";
 @use "cylc/tooltip";
 @use "cylc/mutation_form";
 @use "cylc/menu";