Update index.html

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Author: pballai

site/app/views/default/index.html

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                   <div class="header-4 g-mg-bottom-small">Welcome to Sigma QuickStarts</div>
                   <p class="paragraph-hero g-mg-bottom-large">
                      Maximize your investment in Sigma with easy-to-follow, step-by-step tutorials.<br>
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                      <div class="kpi-container" style="display: flex; align-items: center; justify-content: center; width: 100%; overflow: hidden; margin: 0; padding: 0;">
                         <iframe src="https://app.sigmacomputing.com/embed/5t3nQDpTq3wNb0kV3mNNkX" style="width: 100%; height: 175px; border: none; display: block;"></iframe>
                     </div>
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-                    </div>                  
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                   </p>       
                   <br>