Overhaul IPFS Troubleshooting guides with new content and structure

docs/.vuepress/config.js

@@ -208,11 +208,21 @@ module.exports = {
                 '/how-to/nat-configuration',
                 '/how-to/kubo-rpc-tls-auth',
                 '/how-to/kubo-garbage-collection',
-                '/how-to/troubleshooting',   
+                '/how-to/troubleshooting-kubo',   
                 '/how-to/webtransport',   
                 '/install/run-ipfs-inside-docker',
               ]
             },
+            {
+              title: 'Troubleshooting',
+              sidebarDepth: 1,
+              collapsable: true,
+              children: [
+                '/how-to/troubleshooting',
+                '/how-to/troubleshooting-kubo',
+                '/reference/diagnostic-tools',
+              ]
+            },
             {
               title: 'Manage files',
               sidebarDepth: 1,

docs/.vuepress/redirects

@@ -45,6 +45,7 @@
 /how-to/run-ipfs-inside-docker /install/run-ipfs-inside-docker
 /how-to/ipfs-updater /install/command-line
 /how-to/websites-on-ipfs/link-a-domain /how-to/websites-on-ipfs/custom-domains
+/how-to/gateway-troubleshooting /how-to/troubleshooting
 /install/command-line-quick-start/ /how-to/command-line-quick-start
 /install/js-ipfs/ https://github.com/ipfs/helia/wiki
 /introduction/ /concepts