Fix Safari favicon white border with transparent background

Remove dark background from favicon SVG/ICO/PNG so it blends
with Safari's tab bar instead of showing a bordered dark box.
Keep dark background only on apple-touch-icon for iOS home screen.
Add mask-icon for Safari pinned tabs.

Author: felipefdl

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "claude-plugin"]
+	path = claude-plugin
+	url = git@github.com:network-output/no-skills.git

claude-plugin

@@ -10,6 +10,7 @@
   <link rel="icon" type="image/png" sizes="16x16" href="favicon-16.png">
   <link rel="icon" type="image/svg+xml" href="favicon.svg">
   <link rel="apple-touch-icon" sizes="180x180" href="apple-touch-icon.png">
+  <link rel="mask-icon" href="favicon.svg" color="#00ff88">
   <link rel="canonical" href="https://network-output.com/">
   <meta name="theme-color" content="#0a0a0f">
   <meta name="keywords" content="cli, networking, http, websocket, tcp, udp, mqtt, sse, dns, ping, whois, json, terminal, rust, curl alternative, httpie alternative, command line, network tool">