Add modular SCSS structure and lightbox functionality

Introduce a modular SCSS structure to improve maintainability and organization of stylesheets. Add lightbox functionality for homepage screenshots, including responsive JavaScript behavior and custom styling for enhanced user experience. Update tasks documentation with improvement initiatives for the project.

docs/index.md

@@ -138,10 +138,10 @@ Für mich als Coach & Mediator ist Vertraulichkeit der Schlüssel. Top!"
                     <span class="satag--home-testimonial-title">Project Manager at Company 2</span>
                 </div>
             </div>
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             <div class="satag--home-testimonials-text" data-testimonial-id="3">
                         <img class="satag--home-testimonial-text-logo" src="../../assets/images/home/testimonials/satware-ag.png" alt="satware AG Logo">
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             <p>
                         "The integration capabilities of satware AI with our existing tools made adoption seamless. Our team productivity has increased by 35% since implementation, and the custom agents continue to learn our specific needs."
             </p>
@@ -173,13 +173,13 @@ Für mich als Coach & Mediator ist Vertraulichkeit der Schlüssel. Top!"
                 </div>
             </div>
         </div>
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     </div>
 
 </div>
 <!-- end section testimonials -->
 
+<script src="../javascripts/lightbox.js"></script>
+
 </div>
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