Remove evil chat example (#75)

Removed the evil chat example as requested in #74 since it was not providing value and wasn't working properly. This includes:
- Removing the evil-chat directory
- Removing the evil-chat card from the main index.html

Closes #74

Mentat precommits passed. Log: https://mentat.ai/log/3cf080e4-6685-43a9-ac8c-c8d7994a8957

Co-authored-by: MentatBot <160964065+MentatBot@users.noreply.github.com>

Author: mentatbot[bot]

evil-chat/index.html

@@ -36,10 +36,6 @@ <h3>Image Show</h3>
                     <h3>Image Prompt</h3>
                     <p>AI image generation interface</p>
                 </a>
-                <a href="evil-chat/" class="app-card">
-                    <h3>Evil Chat</h3>
-                    <p>Unique chat experience</p>
-                </a>
             </div>
         </section>