Change all instances of GoPhish to Gophish

[JCantu248]

💡 Summary

Anywhere in the gophish-tools repository where there is an instance or reference to GoPhish, change it to Gophish

Motivation and context

Why does this work belong in this project?

This would keep the naming convention in line with other CISAGov projects using Gophish.

Acceptance criteria

How do we know when this work is done?

• [x] All instances and references to GoPhish are changed to Gophish
• [x] Gophish-tools still works as expected

[ameliav]

https://github.com/cisagov/gophish-tools/pull/50 created for this issue