CHANGE: css logo, bsky link

Changed CSS logo to newest version, added bsky profile link

public/img/icons/bsky.svg

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg id="Ebene_2" data-name="Ebene 2" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 23.98 21.29">
+  <defs>
+    <style>
+      .cls-1 {
+        fill: none;
+        stroke: #000;
+        stroke-linecap: round;
+        stroke-linejoin: round;
+        stroke-width: 1.5px;
+      }
+    </style>
+  </defs>
+  <path class="cls-1" d="M5.62,2.08c2.58,1.93,5.35,5.86,6.37,7.96,1.02-2.11,3.79-6.03,6.37-7.96,1.86-1.4,4.87-2.48,4.87.96,0,.69-.39,5.77-.62,6.59-.8,2.87-3.73,3.6-6.33,3.16,4.55.77,5.7,3.34,3.2,5.9-4.74,4.87-6.82-1.22-7.35-2.78-.1-.29-.14-.42-.14-.31,0-.11-.05.02-.14.31-.53,1.56-2.61,7.65-7.35,2.78-2.5-2.56-1.34-5.13,3.2-5.9-2.6.44-5.52-.29-6.33-3.16-.23-.82-.62-5.9-.62-6.59,0-3.44,3.01-2.36,4.87-.96h0Z"/>
+</svg>