Refactor and document config/datastructure

Also adjusted case for initialisms (e.g., DHCP, TFTP, NFS).

Signed-off-by: Jonathon Anderson <janderson@ciq.co>

internal/app/wwctl/configure/dhcp/main.go

@@ -6,5 +6,5 @@ import (
 )
 
 func CobraRunE(cmd *cobra.Command, args []string) error {
-	return configure.Dhcp()
+	return configure.DHCP()
 }