feat: align navbar items for improved layout consistency

shared/includes/docs/navbar.html

@@ -15,7 +15,7 @@
 				<div id="docsearch"></div>
 			</div>
 			<div class="col d-flex">
-				<ul class="navbar-nav ms-auto gap-2">
+				<ul class="navbar-nav ms-auto gap-2 align-items-center">
 					<div class="nav-item d-none d-md-block">
 						<a href="https://preview.tabler.io" class="nav-link">Preview</a>
 					</div>