fix: add redirects for mining and stacking pages

next.config.js

@@ -455,6 +455,11 @@ async function redirects() {
       destination: '/understand-stacks/atlas-usage',
       permanent: true,
     },
+    {
+      source: '/stacks-blockchain/integrate-stacking',
+      destination: '/understand-stacks/integrate-stacking',
+      permanent: true,
+    },
     {
       source: '/understand-stacks/atlas/usage',
       destination: '/understand-stacks/atlas-usage',
@@ -597,6 +602,11 @@ async function redirects() {
       destination: '/references/stacks-blockchain-api',
       permanent: true,
     },
+    {
+      source: '/mining',
+      destination: '/start-mining',
+      permanent: true,
+    },
   ];
 }