board/common: serve network.local over plain HTTP (port 80)

network.local is a discovery/browse page, not a management interface.
Serving it over HTTP eliminates the self-signed certificate warning
browsers show for .local mDNS names without changing the security
posture of the actual device management pages (still HTTPS-only).

The new port-80 server_name block takes precedence over the catch-all
HTTP → HTTPS redirect in default.conf.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

board/common/rootfs/etc/nginx/available/netbrowse.conf

@@ -1,3 +1,13 @@
+server {
+    listen       80;
+    listen       [::]:80;
+    server_name  network.local;
+
+    location / {
+        include /etc/nginx/netbrowse.conf;
+    }
+}
+
 server {
     listen       443 ssl;
     listen       [::]:443 ssl;