docs: move troubleshooting guides to a single page

docs/src/SUMMARY.md

@@ -8,9 +8,7 @@
   - [Configuration](./deployment/configuration.md)
   - [Deploy the homelab](./deployment/deployment.md)
   - [DNS setup](./deployment/dns.md)
-- [Troubleshooting](./troubleshooting/README.md)
-  - [PXE boot](./troubleshooting/pxe_boot.md)
-  - [ArgoCD]()
+- [Troubleshooting](./troubleshooting.md)
 - [Reference](./reference/README.md)
   - [Architecture]()
   - [FAQ](./reference/faq.md)

docs/src/troubleshooting.md

@@ -1,4 +1,4 @@
-# PXE boot
+# Troubleshooting
 
 ## PXE server logs
 

docs/src/troubleshooting/README.md

@@ -1,3 +0,0 @@
-# Troubleshooting
-
-This section contains some common issues and solutions. If you find any issues that are not listed here, please send me a PR.