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