live-server: add page

pages/common/live-server.md

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+# live-server
+
+> A simple development http server with live reload capability.
+
+* Serve an index.html file, and reload on changes:
+
+`live-server`
+
+* Specify a port from which to serve a file:
+
+`live-server --port=8081`
+
+* Select file other than index.html to serve:
+
+`live-server --open=about.html`
+
+* Proxy all requests for ROUTE to URL:
+
+`live-server --proxy=/:http:localhost:3000`