Marketing-Flyer: Themes mit Hell/Dunkel-Varianten erwähnen.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/marketing/beta-flyer.html

@@ -329,6 +329,7 @@
       <div class="feature"><span class="feature-icon">✦</span><span>Logbuch mit Freunden teilen</span></div>
       <div class="feature"><span class="feature-icon">✦</span><span>Beliebig viele Schiffe und Logbücher</span></div>
       <div class="feature"><span class="feature-icon">✦</span><span class="lang-list"><span class="lang-item"><svg class="feature-flag" viewBox="0 0 5 3" xmlns="http://www.w3.org/2000/svg" aria-hidden="true"><rect width="5" height="1" fill="#000"/><rect y="1" width="5" height="1" fill="#D00"/><rect y="2" width="5" height="1" fill="#FFCE00"/></svg>Deutsch</span><span class="lang-sep">&amp;</span><span class="lang-item"><svg class="feature-flag" viewBox="0 0 60 30" xmlns="http://www.w3.org/2000/svg" aria-hidden="true"><clipPath id="gb-a"><path d="M0 0v30h60V0z"/></clipPath><clipPath id="gb-b"><path d="M30 15h30v15zv15H0z"/></clipPath><g clip-path="url(#gb-a)"><path d="M0 0v30h60V0z" fill="#012169"/><path d="M0 0l60 30m0-30L0 30" stroke="#fff" stroke-width="6"/><path d="M0 0l60 30m0-30L0 30" clip-path="url(#gb-b)" stroke="#C8102E" stroke-width="4"/><path d="M30 0v30M0 15h60" stroke="#fff" stroke-width="10"/><path d="M30 0v30M0 15h60" stroke="#C8102E" stroke-width="6"/></g></svg>Englisch</span></span></div>
+      <div class="feature"><span class="feature-icon">✦</span><span>3 Themes, jeweils mit heller und dunkler Variante</span></div>
       <div class="feature"><span class="feature-icon">✦</span><span>Crafted in Kiel.Sailing.City.</span></div>
     </section>