playbook improvements

[chungers]

• Playbooks now moved to under subcommand playbook
• Changes to Dockerfile to base from docker:latest
• Utility fileserver - for serving http config templates during development

[codecov]

Codecov Report

Merging #470 into master will decrease coverage by 0.02%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           master     #470      +/-   ##
==========================================
- Coverage   68.25%   68.23%   -0.03%     
==========================================
  Files          69       69              
  Lines        4152     4155       +3     
==========================================
+ Hits         2834     2835       +1     
- Misses       1063     1065       +2     
  Partials      255      255

Impacted Files	Coverage Δ
pkg/cli/remote/remote.go	61.97% <60%> (-1.27%)	⬇️

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