Rename service catalog to software catalog, excluding blog posts

Signed-off-by: Joe Porpeglia <josephp@spotify.com>

microsite/pages/en/demos.js

@@ -42,7 +42,7 @@ const Background = props => {
               To explore the UI and basic features of Backstage firsthand, go
               to: <a href="https://demo.backstage.io">demo.backstage.io</a>.
               (Tip: click “All” to view all the example components in the
-              service catalog.)
+              software catalog.)
             </Block.Paragraph>
           </Block.TextBox>
           <Block.Graphics>

microsite/pages/en/index.js

@@ -27,7 +27,7 @@ class Index extends React.Component {
                 An open platform for building developer portals
               </Block.Title>
               <Block.Paragraph>
-                Powered by a centralized service catalog, Backstage restores
+                Powered by a centralized software catalog, Backstage restores
                 order to your infrastructure and enables your product teams to
                 ship high-quality code quickly — without compromising autonomy.
               </Block.Paragraph>
@@ -102,10 +102,10 @@ class Index extends React.Component {
               {' '}
               <img
                 className="Block__GIF"
-                src={`${baseUrl}animations/backstage-service-catalog-icon-1.gif`}
+                src={`${baseUrl}animations/backstage-software-catalog-icon-1.gif`}
               />
               <Block.Subtitle>
-                Backstage Service Catalog{' '}
+                Backstage Software Catalog{' '}
                 <a
                   title="Submit feedback for this feature. Click to learn more about this release."
                   href="https://backstage.io/blog/2020/06/22/backstage-service-catalog-alpha"
@@ -192,7 +192,7 @@ class Index extends React.Component {
 
         <ActionBlock className="stripe bg-teal">
           <ActionBlock.Title>
-            Learn more about the service catalog
+            Learn more about the software catalog
           </ActionBlock.Title>
           <ActionBlock.Link
             href={`https://backstage.io/blog/2020/06/22/backstage-service-catalog-alpha`}