Home page: drop divider-bars markup; show footer-bars; +1.5rem above callouts

- index.md: remove the .home-divider-bars block entirely (now that
  we're keeping it hidden, no need for the markup or the inline Admin
  link inside .bar-light — Admin lives in the .footer-bar-teal again).
- .page-home .footer-bars { display: none } removed, so the
  dark/teal bars shown on every other page now also appear at the
  bottom of the home page above the institutional logos. Spacing
  above + below the bars inherits the existing .site-footer rules,
  matching research/ and the rest.
- .home-callouts: margin-top 0 -> 1.5rem so 'what we do' / mission /
  'we strive' has a line of breathing room beneath the banner.

Author: rhiju

assets/css/style.scss

@@ -343,7 +343,9 @@ hr { border: 0; border-top: 1px dotted $text-faint; margin: 2rem 0; }
   gap: 1.5rem;
   align-items: start;
   max-width: 1022px;
-  margin: 0 auto 2.5rem;
+  /* ~1 line of breathing room above the "what we do" row, matching the
+     spacing-above-text we have on the interior pages. */
+  margin: 1.5rem auto 2.5rem;
   padding: 0 1rem;
 }
 
@@ -905,9 +907,10 @@ details.show-more {
   background-image: url("{{ '/assets/images/site/public/footer_bar_teal.png' | relative_url }}");
 }
 
-/* Home page already has decorative bars between hero and content; suppress the
-   footer pair so the home doesn't look top-heavy with bars. */
-.page-home .footer-bars { display: none; }
+/* Footer bars are now shown on the home page too — the home divider
+   bars between hero and callouts have been removed, so the footer
+   bars are the only horizontal divider above the institutional logos
+   (matching every other page). */
 
 .institutional-logos {
   display: flex;

index.md

@@ -9,13 +9,6 @@ slug: home
   <div class="home-banner" role="img" aria-label="Das Lab — RNA fold and function from scratch"></div>
 </div>
 
-<div class="home-divider-bars">
-  <div class="bar-dark"></div>
-  <div class="bar-light">
-    <a class="footer-admin home-admin" href="https://github.com/DasLab/DasLab.github.io/blob/main/CONTRIBUTING.md" target="_blank" rel="noopener">Admin</a>
-  </div>
-</div>
-
 <div class="home-callouts">
   <p class="home-callout-left">what <br class="callout-break"><span class="accent">we do</span></p>
   <p class="home-mission">