feat: add message component (#1082)

This PR adds a simple message component that replaces bulma's default message.

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/1082
Reviewed-by: dpschen <dpschen@noreply.kolaente.de>
Co-authored-by: konrad <k@knt.li>
Co-committed-by: konrad <k@knt.li>

src/styles/theme/_index.scss

@@ -7,5 +7,4 @@
 @import "form";
 @import "link-share";
 @import "loading";
-@import "notification";
 @import "flatpickr";

src/styles/theme/notification.scss

@@ -1,12 +0,0 @@
-.notification {
-  border: $thickness solid $border;
-}
-
-.notifications {
-  left: 0.5rem !important;
-  bottom: 1rem !important;
-}
-
-.message .message-body {
-	border: $thickness solid;
-}