Update hero section and color scheme across the application

- Changed the hero headline and sub-headline for better clarity and engagement.
- Added a secondary button for demo booking in the hero section.
- Updated primary color scheme in CSS files to unify the visual identity.
- Adjusted background and text colors to enhance readability and aesthetics.
- Removed unused CSS classes to streamline styles.
- Updated Tailwind configuration to reflect new color values for primary and secondary themes.

assets/scss/custom.scss

@@ -307,14 +307,6 @@ section {
     }
 }
 
-// Dark context (homepage header, hero, footer)
-// Overwrite primary button design
-.btn-primary {
-    background-color: $orange;
-    color: white;
-    border: 1px solid $orange;
-    border-radius: 2em;
-}
 
 .download {
   margin-right: auto;