Revert "ukraine: add donate banner"

This reverts commit 3272f07439.

components/Header.js

@@ -1,15 +1,6 @@
 export default function Header(props) {
     return (
         <header className="header">
-            <a
-                href="https://www.comebackalive.in.ua/"
-                style={{ height: "64px", textAlign: "center" }}
-                onClick={() => plausible("ukraine_banner_clicked")}
-                className="flag--ukraine"
-                target="_blank"
-            >
-                Help Ukraine
-            </a>
             <nav className="nav" role="navigation" aria-label="main navigation">
                 <div className="header__container">
                     <a href="/" className="header__container__logo underlined">

styles/index.scss

@@ -1,4 +1,2 @@
 @import "foundation/index";
 @import "components/index";
-
-@import "./ukraine.scss";

styles/ukraine.scss

@@ -1,17 +0,0 @@
-// https://codepen.io/esironal/pen/yLzaOb
-
-// Two halfs flag
-@function halfs($first, $second, $or: -180deg) {
-    @return linear-gradient($or, $first 50%, $second 50%);
-}
-
-%flag {
-    width: 100%;
-    height: 100%;
-}
-
-.flag--ukraine {
-    @extend %flag;
-    background: halfs(#0057B7, #FFDD00);
-    color: white;
-}