add a 404 page

Signed-off-by: Toshaan Bharvani <toshaan@vantosh.com>

themes/openpowerfoundation/layouts/404.html

@@ -0,0 +1,34 @@
+i{{ partial "header.html" . }}
+
+{{ partial "navbar.html" . }}
+
+<main>
+<section id="lost">
+	<div class="container-fluid">
+
+		<div class="section-header">
+			<h3 class="section-title">You are lost.</h3>
+			<span class="section-divider"></span>
+			<p class="section-description">404 Not Found error</p>
+		</div>
+
+		<div class="row">
+			<div class="col-lg-1">&nbsp;</div>
+			<div class="col-lg-10 col-lg-offset-4 text-center text-center">
+				<div class="gallery-item wow fadeInUp">
+					<img src="/img/powerlinuxlaptop.png" alt="404">
+				</div>
+			</div>
+			<div class="col-lg-1">&nbsp;</div>
+		</div>
+
+		<div class="container">&nbsp;</div>
+
+	</div>
+</section>
+
+</main>
+
+<div class="container">&nbsp;</div>
+
+{{ partial "footer.html" . }}