feature(help): add help nav and icon

app/components/Nav/Nav.js

@@ -6,6 +6,7 @@ import Isvg from 'react-inlinesvg'
 import walletIcon from 'icons/wallet.svg'
 import peersIcon from 'icons/peers.svg'
 import networkIcon from 'icons/globe.svg'
+import helpIcon from 'icons/help.svg'
 
 import styles from './Nav.scss'
 
@@ -34,6 +35,12 @@ const Nav = ({ openPayForm, openRequestForm }) => (
           <span>Network</span>
         </li>
       </NavLink>
+      <NavLink exact to='/help' activeClassName={styles.active} className={styles.link}>
+        <li>
+          <Isvg styles={{ verticalAlign: 'middle' }} src={helpIcon} />
+          <span>Help</span>
+        </li>
+      </NavLink>
     </ul>
     <div className={styles.buttons}>
       <div className={`buttonPrimary ${styles.button}`} onClick={openPayForm}>

app/icons/help.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-life-buoy"><circle cx="12" cy="12" r="10"></circle><circle cx="12" cy="12" r="4"></circle><line x1="4.93" y1="4.93" x2="9.17" y2="9.17"></line><line x1="14.83" y1="14.83" x2="19.07" y2="19.07"></line><line x1="14.83" y1="9.17" x2="19.07" y2="4.93"></line><line x1="14.83" y1="9.17" x2="18.36" y2="5.64"></line><line x1="4.93" y1="19.07" x2="9.17" y2="14.83"></line></svg>