Make Getting Started consistent

Author: amyrlam

docusaurus/website/i18n/en.json

@@ -139,7 +139,7 @@
       }
     },
     "links": {
-      "Getting started": "Getting started",
+      "Getting Started": "Getting Started",
       "Help": "Help",
       "GitHub": "GitHub"
     },

docusaurus/website/pages/en/index.js

@@ -77,7 +77,7 @@ class HomeSplash extends React.Component {
           <ProjectTitle />
           <PromoSection>
             <Button href={docUrl('getting-started', language)}>
-              Get started
+              Getting Started
             </Button>
             <Button href={docUrl('documentation-intro', language)}>Documentation</Button>
           </PromoSection>

docusaurus/website/siteConfig.js

@@ -26,7 +26,7 @@ const siteConfig = {
 
   // For no header links in the top nav bar -> headerLinks: [],
   headerLinks: [
-    { doc: 'getting-started', label: 'Getting started' },
+    { doc: 'getting-started', label: 'Getting Started' },
     { href: 'https://reactjs.org/community/support.html', label: 'Help' },
     {
       href: 'https://www.github.com/facebook/create-react-app',