Updated master branch links to main

- we switched the branch names a while back but these were never updated

README.md

@@ -13,7 +13,7 @@
     <a href="https://ghost.org/">Ghost.org</a> •
     <a href="https://forum.ghost.org">Forum</a> •
     <a href="https://ghost.org/docs/">Docs</a> •
-    <a href="/TryGhost/Ghost/blob/master/.github/CONTRIBUTING.md">Contributing</a> •
+    <a href="/TryGhost/Ghost/blob/main/.github/CONTRIBUTING.md">Contributing</a> •
     <a href="https://twitter.com/ghost">Twitter</a>
     <br /><br />
     <a href="https://ghost.org/">

ghost/admin/app/components/modals/settings/about.hbs

@@ -10,7 +10,7 @@
         <div class="gh-about-box">
             {{#if this.upgradeStatus.message}}
                 <section class="gh-upgrade-notification">
-                    <strong>Update available!</strong> 
+                    <strong>Update available!</strong>
                     <div>
                         {{this.upgradeStatus.message}}
                     </div>
@@ -68,7 +68,7 @@
             </section>
             <div class="gh-copyright-info">
                 <div>
-                    Copyright &copy; 2013 &ndash; {{this.copyrightYear}} Ghost Foundation, released under the <a href="https://github.com/TryGhost/Ghost/blob/master/LICENSE" target="_blank" rel="noopener noreferrer">MIT license</a>. 
+                    Copyright &copy; 2013 &ndash; {{this.copyrightYear}} Ghost Foundation, released under the <a href="https://github.com/TryGhost/Ghost/blob/main/LICENSE" target="_blank" rel="noopener noreferrer">MIT license</a>.
                 </div>
                 <div>
                     <a href="https://ghost.org/" target="_blank" rel="noopener noreferrer">Ghost</a> is a registered trademark of <a href="https://ghost.org/trademark/" target="_blank" rel="noopener noreferrer">Ghost Foundation Ltd</a>.