webconfig: improve html and add favicon

Change-Id: I68060658fee69ea7ab4571a44c293f0ad63b9c78
Reviewed-on: https://go-review.googlesource.com/c/vulndb/+/410554
Run-TryBot: Jamal Carvalho <jamal@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
Auto-Submit: Jamal Carvalho <jamal@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
diff --git a/webconfig/404.html b/webconfig/404.html
index ec5faed..4ec3376 100644
--- a/webconfig/404.html
+++ b/webconfig/404.html
@@ -1,20 +1,19 @@
 <!DOCTYPE html>
-<html lang="en" data-layout="">
+<html lang="en">
   <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Not Found: Go Vulnerability Database</title>
   </head>
-<body>
-  <h1>Not Found</h1>
-
-<p>
-  We couldn't find what you're looking for in the Go Vulnerability Database.
-</p>
-<p>
-  At the top level, the database is organized by module. The ID directory lists Go
-  vulnerabilities by ID.
-</p>
-<p>
-  Check out https://go.dev/security/vulndb for more information.
-</p>
-</body>
+  <body>
+    <h1>Not Found</h1>
+    <p>
+      We couldn't find what you're looking for in the Go Vulnerability Database.
+    </p>
+    <p>
+      At the top level, the database is organized by module. The ID directory
+      lists Go vulnerabilities by ID.
+    </p>
+    <p>Check out https://go.dev/security/vulndb for more information.</p>
+  </body>
 </html>
diff --git a/webconfig/favicon.ico b/webconfig/favicon.ico
new file mode 100644
index 0000000..8d22584
--- /dev/null
+++ b/webconfig/favicon.ico
Binary files differ
diff --git a/webconfig/index.html b/webconfig/index.html
index 85de055..d762e30 100644
--- a/webconfig/index.html
+++ b/webconfig/index.html
@@ -1,17 +1,16 @@
 <!DOCTYPE html>
-<html lang="en" data-layout="">
+<html lang="en">
   <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Go Vulnerability Database</title>
   </head>
-<body>
-  <h1>Go Vulnerability Database</h1>
-
-<p>
-  This is the Go vulnerability database. It is meant to be accessed by programs
-  that want to find vulnerabilities associated with Go modules.
-</p>
-<p>
-  Check out https://go.dev/security/vulndb for more information.
-</p>
-</body>
+  <body>
+    <h1>Go Vulnerability Database</h1>
+    <p>
+      This is the Go vulnerability database. It is meant to be accessed by
+      programs that want to find vulnerabilities associated with Go modules.
+    </p>
+    <p>Check out https://go.dev/security/vulndb for more information.</p>
+  </body>
 </html>