chore: replace discord banner with kofi

client/css/app.css

@@ -338,7 +338,7 @@ a:active {
 }
 
 .surviv-shirts {
-  background-image: url(/img/discord-promo.png);
+  background-image: url(/img/survev-kofi.png);
 }
 
 /*
@@ -455,6 +455,12 @@ a:active {
   box-shadow: inset 0 -4px #9b2354;
 }
 
+.btn-kofi {
+  background-image: url(/img/icon_kofi.png);
+  background-color: #ff6433;
+  box-shadow: inset 0 -4px #be4926;
+}
+
 .btn-darken:hover,
 .btn-darken:active {
   color: inherit;

client/index.html

@@ -788,7 +788,7 @@ <h2 data-l10n='index-account'>Account</h2>
             <div id='left-column' class='menu-column'>
               <div id='ad-block-left'>
                 <div class='surviv-shirts'>
-                  <a href='https://discord.gg/6uRdCdkTPt' target="_blank"></a>
+                  <a href='https://ko-fi.com/surve' target="_blank"></a>
                 </div>
                 <!--
                 <div class='adblock-plea'>
@@ -809,6 +809,7 @@ <h2 data-l10n='index-account'>Account</h2>
                     <a href='https://www.instagram.com/survev/' target='_blank' class='btn-social btn-darken btn-instagram'></a>
                     -->
                     <a href='https://discord.gg/6uRdCdkTPt' target='_blank' class='btn-social btn-darken btn-discord'></a>
+                    <a href='https://ko-fi.com/survev' target='_blank' class='btn-social btn-darken btn-kofi'></a>
                     <!--
                     <a href='https://www.youtube.com/c/survev?sub_confirmation=1' target='_blank' class='btn-social btn-darken btn-youtube'></a>
                     -->