rewrite repo location urls

microsite/pages/en/index.js

@@ -31,7 +31,7 @@ class Index extends React.Component {
                 high-quality code quickly — without compromising autonomy.
               </Block.Paragraph>
               <Block.LinkButton
-                href={'https://github.com/spotify/backstage#getting-started'}
+                href={'https://github.com/backstage/backstage#getting-started'}
               >
                 GitHub
               </Block.LinkButton>
@@ -282,7 +282,7 @@ class Index extends React.Component {
             Build your own software templates
           </ActionBlock.Title>
           <ActionBlock.Link
-            href={`https://github.com/spotify/backstage/blob/master/docs/features/software-templates/extending/index.md`}
+            href={`https://github.com/backstage/backstage/blob/master/docs/features/software-templates/extending/index.md`}
           >
             Contribute
           </ActionBlock.Link>

microsite/pages/en/plugins.js

@@ -98,11 +98,11 @@ const Plugins = () => (
           <Container className="PluginCardFooter">
             <p>
               See what plugins are already{' '}
-              <a href="https://github.com/spotify/backstage/issues?q=is%3Aissue+is%3Aopen+label%3Aplugin+sort%3Areactions-%2B1-desc">
+              <a href="https://github.com/backstage/backstage/issues?q=is%3Aissue+is%3Aopen+label%3Aplugin+sort%3Areactions-%2B1-desc">
                 in progress
               </a>{' '}
               and 👍. Missing a plugin for your favorite tool? Please{' '}
-              <a href="https://github.com/spotify/backstage/issues/new?labels=plugin&template=plugin_template.md&title=%5BPlugin%5D+THE+PLUGIN+NAME">
+              <a href="https://github.com/backstage/backstage/issues/new?labels=plugin&template=plugin_template.md&title=%5BPlugin%5D+THE+PLUGIN+NAME">
                 suggest
               </a>{' '}
               a new one.