Get images working from .md post files

gatsby-config.js

@@ -15,6 +15,20 @@ module.exports = {
         path: `${__dirname}/src/posts`,
       },
     },
-    `gatsby-transformer-remark`
+    `gatsby-transformer-sharp`,
+    `gatsby-plugin-sharp`,
+    {
+      resolve: `gatsby-transformer-remark`,      
+      options: {
+        plugins: [
+          {
+            resolve: `gatsby-remark-images`,
+            options: {
+              maxWidth: 800,
+            },
+          },
+        ],
+      },
+    }
   ],
 }