fix(contrib/userdata): nse uses `docker exec`

Fixes shells into the container not having the correct envvars
Merge pull request #2348 from Xe/fix/contrib-user-data/nse-uses-docker-exec

fix(contrib/userdata): nse uses `docker exec`
docs(README.md): replace moved DNS link
docs(contrib): replace moved DNS links
Merge pull request #2358 from Paperback/patch-1

docs(README.md): replace moved DNS link
style(logger): add code doc strings
style(deisctl): add code doc strings and fix minor issues