Remove Infisical credential pointers; inline credentials in component docs

Reverses the recent Infisical-pointer convention. Each <service>.md
holds its credentials inline under the Access section again. The
Infisical service itself still runs as a Docker stack on the docker
host — it just isn't the source of truth for these docs anymore.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

desktop.md

@@ -4,7 +4,7 @@
 
 - **Hostname**: DESKTOP-1BEK7OR
 - **OS**: Windows 10 (PowerShell 5.1.19041.6456)
-- **Credentials**: dohertj2 / `[Infisical: homelab/infrastructure/windows-hosts/DESKTOP_ADMIN_PWD]`
+- **Credentials**: dohertj2 / `Sonamu89`
 - **Remote access**: SSH (passwordless), WinRM (fallback)
 
 ### Running Commands