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 ) =>

src/style/_layout.scss

@@ -671,15 +671,17 @@
       }
     }
 
+    .servers-title {
+      margin: 20px;
+      line-height: 2em;
+      font-weight: bold;
+    }
+
     .servers
     {
         display: flex;
         align-items: center;
 
-        .servers-title {
-          margin-right: 1em;
-        }
-
          > label
         {
             font-size: 12px;