Add real buttons to document header

Fixed: Incorrect page title when starting a new doc
Fixed: Linting error

app/components/Modal.js

@@ -46,7 +46,8 @@ const Modal = ({
         <Content column>
           {title && <h1>{title}</h1>}
           <Close onClick={onRequestClose}>
-            <CloseIcon size={32} />
+            <CloseIcon size={40} />
+            <Esc>esc</Esc>
           </Close>
           {children}
         </Content>
@@ -80,6 +81,13 @@ const StyledModal = styled(ReactModal)`
   outline: none;
 `;
 
+const Esc = styled.span`
+  display: block;
+  text-align: center;
+  margin-top: -10px;
+  font-size: 13px;
+`;
+
 const Close = styled.a`
   position: fixed;
   top: 16px;