ndg: upgrade to v0.6.0

this release includes lightning node setup workflow without using any
command line or SSH.

see some screenshots on the release page:
https://git.qcode.ch/nakamochi/ndg/releases/tag/v0.6.0

ndg/env

@@ -1,6 +1,6 @@
-NDG_VERSION=v0.5.1
-NDG_URL_AARCH64=https://git.qcode.ch/attachments/2e5d401a-c465-46c7-a23c-dff0c3bb6910
-NDG_SHA256_AARCH64=d117226787b9c436104e886e62c8193b9fd2abb9a73a8f48a2a77510783ff9c0
+NDG_VERSION=v0.6.0
+NDG_URL_AARCH64=https://git.qcode.ch/attachments/b8e6e15c-39bf-4ffb-aa93-5e3498ac56a2
+NDG_SHA256_AARCH64=a0947f51182405336d66c8946faa968d3cacf54ecff5f590809db44cc057c8ef
 
 NDG_HOME=/home/uiuser
 NDG_BINDIR=$NDG_HOME/$NDG_VERSION