fix(site): fix unnecessarily large bundle/html sizes (#1790)

Remove unneeded `file` property that was causing huge output files
to be emitted.

Author: sokra

src/components/Site/Site.jsx

@@ -43,18 +43,17 @@ const Site = ({
           .map((section) => ({
             title: section.path.title,
             url: section.url,
-            pages: section.pages.map(page => ({
-              file: page.file,
-              title: page.file.title,
-              url: page.url
-            })).sort(({ file: { attributes: a }}, { file: { attributes: b }}) => {
+            pages: section.pages.slice().sort(({ file: { attributes: a }}, { file: { attributes: b }}) => {
               let group1 = a.group.toLowerCase();
               let group2 = b.group.toLowerCase();
 
               if (group1 < group2) return -1;
               if (group1 > group2) return 1;
               return a.sort - b.sort;
-            })
+            }).map(page => ({
+              title: page.file.title,
+              url: page.url
+            }))
           }))
       } />