Fix mobile collapse functionality and remove redundant CSS

Co-authored-by: benbalter <[email protected]>

Author: Copilot

src/components/Navigation.astro

@@ -138,7 +138,6 @@ const navClasses = hero
   }
 
   .navbar-collapse {
-    display: flex;
     align-items: center;
   }
 
@@ -149,7 +148,6 @@ const navClasses = hero
     list-style: none;
     padding-left: 0;
     margin: 0;
-    margin-right: auto;
   }
 
   .nav-link {