[web] Drop core/NotificationMark component (#980)

Drops the core/`NotificationMark` component and its styles since they are no longer used since #886.

web/src/assets/styles/blocks.scss

@@ -215,35 +215,6 @@
   }
 }
 
-span.notification-mark {
-  --nm-border-width: 0;
-  --nm-border-color: transparent;
-  --nm-border: var(--nm-border-width) solid var(--nm-border-color);
-  --nm-size: 8px;
-  --nm-margin-inline: var(--nm-size, 5px);
-  --nm-display: inline-block;
-  --nm-color: #00BFFF; //deepskyblue
-
-  margin-inline: var(--nm-margin-inline);
-  display: var(--nm-display);
-  background: var(--nm-color);
-  border: var(--nm-border);
-  width: var(--nm-size);
-  height: var(--nm-size);
-  border-radius: 999px;
-}
-
-span.notification-mark[data-variant="sidebar"] {
-  --nm-size: calc(var(--fs-base) + var(--nm-border-width));
-  --nm-display: initial;
-  --nm-border-width: 2px;
-  --nm-border-color: var(--color-primary);
-  --nm-margin-inline: 0;
-
-  position: absolute;
-  right: 0;
-}
-
 .issue {
   --icon-size: 1rem;
 

web/src/components/core/index.js

@@ -52,7 +52,6 @@ export { default as ValidationErrors } from "./ValidationErrors";
 export { default as Terminal } from "./Terminal";
 export { default as Tip } from "./Tip";
 export { default as ShowTerminalButton } from "./ShowTerminalButton";
-export { default as NotificationMark } from "./NotificationMark";
 export { default as NumericTextInput } from "./NumericTextInput";
 export { default as PasswordInput } from "./PasswordInput";
 export { default as DevelopmentInfo } from "./DevelopmentInfo";