Fix Lumen logo on error pages

[peter-hank]

Ready for merge?

YES

What does this PR do?

Fixes the Lumen database logo on the all error pages.

How can a reviewer manually see the effects of these changes?

Run the application in the production mode and provoke it to throw errors.

What are the relevant tickets?

• https://cyber.harvard.edu/projectmanagement/issues/*16042*

Todo:

- [ ] Tests
- [ ] Documentation
- [ ] Stakeholder approval

Requires Database Migrations?

NO

Includes new or updated dependencies?

NO

[peter-hank]

I've decided to keep it simple and just add the image to the public folder instead of converting all the templates to erb. It's simpler and faster, it's just plain HTML. We could use the image in the maintenance page template too.

[coveralls]

Pull Request Test Coverage Report for Build 834

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 83.509%

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Totals
Change from base Build 832:	0.0%
Covered Lines:	1742
Relevant Lines:	2086

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💛 - Coveralls

[thatandromeda]

public is great - nothing to worry about if the app 500s and borks the asset pipeline.