add moonbeam (#43)

Co-authored-by: Nena <[email protected]>

Author: nenadjaja

pages/en/index.mdx

@@ -328,6 +328,12 @@ The Graph supports the following networks on The Graph Network and the Hosted Se
         href: 'https://aurora.dev/',
         beta: true,
       },
+      {
+        title: 'Moonbeam',
+        image: '/img/networks/moonbeam.svg',
+        href: 'https://moonbeam.network/',
+        beta: true,
+      },
     ].map((network, index) => (
       <Flex.Column as="li" key={index}>
         <Text as="div" size="14px" color="White48" sx={{ textAlign: 'center' }}>