Remove hardwired "Server" header, make global one prettier

src/core/components/layouts/base.jsx

@@ -95,6 +95,7 @@ export default class BaseLayout extends React.Component {
 
             { servers && servers.size ? (
               <div className="server-container">
+                <span className="servers-title">Server</span>
                 <Col className="servers wrapper" mobile={12}>
                   <Servers
                     servers={servers}

src/core/plugins/oas3/components/servers.jsx

@@ -95,7 +95,6 @@ export default class Servers extends React.Component {
     return (
       <div>
         <label htmlFor="servers">
-          <span className="servers-title">Servers</span>
           <select onChange={ this.onServerChange }>
             { servers.valueSeq().map(
               ( server ) =>