Update k8s user guide to use deployments

[edrevo]

Which issue does this PR close?

Closes #473.

What changes are included in this PR?

• Rename port to bind-port since the configure_me create was trying to parse an env var that was being autopopulated by Kubernetes
• Change the user guide for k8s

[edrevo]

cc @andygrove

[codecov-commenter]

Codecov Report

Merging #474 (56aeaea) into master (1601112) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #474   +/-   ##
=======================================
  Coverage   75.84%   75.84%           
=======================================
  Files         153      153           
  Lines       25872    25872           
=======================================
  Hits        19622    19622           
  Misses       6250     6250           

Impacted Files	Coverage Δ
ballista/rust/executor/src/main.rs	0.00% <0.00%> (ø)
ballista/rust/scheduler/src/main.rs	0.00% <0.00%> (ø)

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[andygrove]

LGTM. Thanks @edrevo