update unconference speaker (#1473)

We had a last minute change and want to preserve this for the audience.

Author: dariagrudzien

public/beginners-day-unconference/vaclav_kotyk.jpg

@@ -69,11 +69,11 @@ Whether you're switching careers or just starting out, this is your chance to le
   />
 
   <ProfileCard
-    name="Barbora Němcová"
-    position="Head of HR"
-    company="Pale Fire Capital"
-    avatar="/beginners-day-unconference/barbora_nemcova.jpg"
-    url="https://www.linkedin.com/in/barbora-nemcova/"
+    name="Václav Kotyk"
+    position="Senior Technical Talent Sourcer"
+    company="SentinelOne"
+    avatar="/beginners-day-unconference/vaclav_kotyk.jpg"
+    url="https://www.linkedin.com/in/vaclavkotyk/"
   />
 </div>