Quitamos svelte para dejar astro que hace lo mismo para nosotros

src/components/Navbar.astro

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+<main>
+    <nav class="navbar navbar-expand-md bg-light">
+        <div class="container-fluid">
+          <a class="navbar-brand" href="#">EcoFuturo</a>
+          <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
+            <span class="navbar-toggler-icon"></span>
+          </button>
+          <div class="collapse navbar-collapse" id="navbarSupportedContent">
+            <ul class="navbar-nav me-auto mb-2 mb-lg-0">
+              <li class="nav-item">
+                <a class="nav-link active" aria-current="page" href="#">Inicio</a>
+              </li>
+              <li class="nav-item">
+                <a class="nav-link disabled" href="#">Posts</a>
+              </li>
+              <li class="nav-item">
+                <a class="nav-link disabled" href="#">Proyectos</a>
+              </li>
+            </ul>
+          </div>
+        </div>
+      </nav>
+</main>