Remove the footnote line from Brand Guidelines

Dropped the "reflects oursqlfoundation.org as published..." note and
its now-unused .brand-footnote CSS (both themes).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: Mazizova

assets/scss/_about.scss

@@ -856,17 +856,6 @@
   strong { color: $off-white; }
 }
 
-.brand-footnote {
-  font-size: 0.875rem;
-  color: $muted;
-  line-height: 1.6;
-  padding-top: 1.5rem;
-  border-top: 1px solid $dark-border;
-  margin: 0;
-
-  strong { color: $off-white; }
-}
-
 @media (max-width: $break-sm) {
   .brand-logo-grid,
   .brand-color-grid {

assets/scss/_light-theme.scss

@@ -460,12 +460,6 @@
     strong { color: #0f172a; }
   }
 
-  .brand-footnote {
-    color: #64748b;
-    border-top-color: #dde3ed;
-    strong { color: #0f172a; }
-  }
-
   // Contribute page
   .contribute-method {
     background: #ffffff;

layouts/about/brand-guidelines.html

@@ -135,10 +135,5 @@ <h1>Brand <span class="brand-gradient-text">Guidelines</span></h1>
     </div>
   </div>
 
-  {{/* ── Footnote ── */}}
-  <div class="about-block about-prose">
-    <p class="brand-footnote"><strong>Brand Guidelines</strong> — reflects oursqlfoundation.org as published. Update this page when the site's logo, palette, or type change; don't let it drift into a separate source of truth.</p>
-  </div>
-
 </div>
 {{ end }}