content(speakers): add Tomáš Grussmann photo

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: MrSpamer Bot

html/img/speaker/tomas-grussmann.png

@@ -369,7 +369,7 @@ <h3 class="program-name">Testy, které tvoří realitu: <br>stav aplikace na vy
             <div class="program-box">
                 <div class="program-time">
                     <span>17:00</span>
-                    <!-- <img class="speaker" src="img/speaker/tomas-grussmann.jpg"> -->
+                    <img class="speaker" src="img/speaker/tomas-grussmann.png">
                 </div>
                 <div class="program-text">
                     <h3 class="program-name">AI workflows v game developmentu</h3>