Removed "V4" from API description

Author: Dorthu

src/App.js

@@ -148,7 +148,7 @@ browserHistory.listen(function (location) {
 
 window.setTitle = function (newTitle) {
   const title = document.querySelector('title');
-  title.textContent = 'API v4 Documentation | Linode Developers';
+  title.textContent = 'API Documentation | Linode Developers';
 
   if (newTitle) {
     title.textContent = `${newTitle} | ${title.textContent}`;

src/getting_started/guides/python/Introduction.js

@@ -23,7 +23,7 @@ export default function Introduction(props) {
       </header>
       <section>
         <p>
-          With the release of API V4, Linode has also released an official Python library.
+          With the release of API, Linode has also released an official Python library.
           This guide is a simple introduction to working with the Python library.
           The official Linode Python library is open source on&nbsp;
           <ExternalLink to="http://github.com/Linode/python-linode-api">
@@ -43,7 +43,7 @@ export default function Introduction(props) {
       <section>
         <h2>Connecting to the API</h2>
         <p>
-          The Python library connects to the Linode API V4 using the LinodeClient class,
+          The Python library connects to the Linode API using the LinodeClient class,
           which expects an OAuth Token in his constructor.
         </p>
         <i>All example code in this guide is executed in a Python shell.</i>

src/getting_started/intros/Introduction.js

@@ -15,7 +15,7 @@ export default function Introduction() {
       <section>
         <br />
         <p>
-          The Linode APIv4 is an HTTP service that follows (to a large extent)&nbsp;
+          The Linode API is an HTTP service that follows (to a large extent)&nbsp;
           <ExternalLink to="https://en.wikipedia.org/wiki/Representational_state_transfer">REST</ExternalLink>
           &nbsp;style. Resources like Linodes have predictable URLs that use standard
           HTTP methods to manipulate and return standard HTTP status codes to tell you how
@@ -27,7 +27,7 @@ export default function Introduction() {
           </Link> to get started making API calls using a Personal Access Token (PAT).
         </div>
         <p>
-          All APIv4 endpoints are located at:
+          All API endpoints are located at:
         </p>
         <section>
           <Code example={`${API_ROOT}/${API_VERSION}/*`} name="bash" noclipboard />

src/layouts/Layout.js

@@ -49,7 +49,7 @@ export default class Layout extends Component {
               </span>
             </Link>
           </div>
-          <span className="MainHeader-title">Linode API v4 Documentation</span>
+          <span className="MainHeader-title">Linode API Documentation</span>
           <button
             className="ToggleNav navbar-toggler navbar-toggler-right collapsed"
             type="button"