Change the API Group from porter.sh/v1 to getporter.org/v1

[VinozzZ]

Since we have moved our main domain from porter.sh to getporter.org, we would like to keep things consistent across all projects. Therefore, this PR changes the apiGroup from porter.sh to getporter.org
close: #139

[codecov]

Codecov Report

Merging #140 (27af2b7) into main (0a68c40) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #140   +/-   ##
=======================================
  Coverage   75.58%   75.58%           
=======================================
  Files          13       13           
  Lines        1536     1536           
=======================================
  Hits         1161     1161           
  Misses        242      242           
  Partials      133      133           

Flag	Coverage Δ
unit-tests	75.58% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
api/v1/installation_types.go	75.00% <ø> (ø)
controllers/agentaction_controller.go	83.29% <ø> (ø)
controllers/agentconfig_controller.go	71.04% <ø> (ø)
controllers/credentialset_controller.go	77.61% <ø> (ø)
controllers/installation_controller.go	75.93% <ø> (ø)
controllers/parameterset_controller.go	77.61% <ø> (ø)

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[carolynvs]

I found a few files that also need to be updated:

• PROJECT
• tests/integration/suite_test.go (line 134)
• main.go (line 57)

There are also some links that still reference our old v1 site that it would be nice to just quickly fix (release-v1.porter.sh -> getporter.org)