fix(build): issues/274 update proxy docker port mapping

[cdcabrera]

What's included

• fix(build): issues/274 update proxy docker port mapping
  • build, API updates, proxy run origin header needs port 443
  • docs, contributing reference added for port 443 troubleshooting

Notes

• This relates to recent permissions changes on the RHSM API.
  • We can no longer utilize 1337 the origin header requires being set as 443
• This may cause issues if external teams require access to the API and are attempting to develop on the local proxy. ReadMe should be updated to highlight this.

How to test

Proxy run check

1. update the NPM packages with $ yarn
2. make sure Docker is running, plus on network, then
3. $ yarn start:proxy
4. confirm you can interact with the Subs Watch interface, graph should be visible, opt-in should function, etc...

Example

...

Updates issue/story

closes #274

[codecov-io]

Codecov Report

Merging #276 into ci will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##               ci     #276   +/-   ##
=======================================
  Coverage   92.36%   92.36%           
=======================================
  Files          47       47           
  Lines        1022     1022           
  Branches      240      240           
=======================================
  Hits          944      944           
  Misses         72       72           
  Partials        6        6           

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