add vim normal mode

nord-polar-night-aurora.scss

 $ui-code-chunk-background: $nord1;
 $ui-selection            : transparentize($nord3, 0.6);
 $ui-cursor               : $nord9;
+$ui-cursor-normal-mode   : $ui-cursor;
 $ui-margin-line          : lighten($ui-selection, 5%);
 $ui-gutter-color         : transparentize($ui-foreground, 0.75);
 $ui-gutter-background    : $ui-background;

oceanic-plus.scss

 $ui-code-chunk-background: $base01;
 $ui-selection            : transparentize($base05, 0.6);
 $ui-cursor               : $base0A;
+$ui-cursor-normal-mode   : $ui-cursor;
 $ui-margin-line          : transparentize($ui-selection, 0.25);
 $ui-gutter-color         : transparentize($ui-foreground, 0.5);
 $ui-gutter-background    : $ui-background;

rsthemes/nord-polar-night-aurora.rstheme

   color: #81a1c1;
 }
 
+.normal-mode .ace_cursor {
+  border: 0 !important;
+  background-color: #81a1c1;
+  opacity: 0.5;
+}
+
 .ace_marker-layer .ace_selection {
   background: rgba(76, 86, 106, 0.4);
 }

rsthemes/oceanic-plus.rstheme

   color: #FAC863;
 }
 
+.normal-mode .ace_cursor {
+  border: 0 !important;
+  background-color: #FAC863;
+  opacity: 0.5;
+}
+
 .ace_marker-layer .ace_selection {
   background: rgba(192, 197, 206, 0.4);
 }

rstudio/_rstudio-dark.scss

 .ace_cursor {
 	color: $ui-cursor;
 }
+.normal-mode .ace_cursor {
+  border: 0!important;
+  background-color: $ui-cursor-normal-mode;
+  opacity: 0.5;
+}
 .ace_marker-layer {
 	.ace_selection {
 		background: $ui-selection;