Fixing images so we can run the app locally

[codyseibert]

depends on #453, don't merge this until the API PR is deployed.

#454

Well detailed description of the change :

When trying to connect the UI to a locally running mumble api, the image were not loading correctly. This change wraps all images in a getImageUrl function so we can abstract where those images are located.

Type of change :

• Bug fix

• New feature

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the STYLE_GUIDE of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• All new and existing tests passed.

Reviewers

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