Image endpoints

[AlDu2407]

GET endpoint:

• Added new handler for fetching previously uploaded images from Urchin.
• Added structs to allow handling of responses with compiler support.
• Added required functions for the database to fetch images.

DELETE endpoint:

• Added new handler for deleting previously uploaded images from Urchin.
• Added required functions for the database to delete images.

General update:

• Added structs to allow handling of responses with compiler support.
• Restructured API to used path variables for the delete endpoints.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 37.60684% with 146 lines in your changes are missing coverage. Please review.

Project coverage is 41.09%. Comparing base (cf04c2f) to head (d8a25ab).

Files	Patch %	Lines
app/image.go	1.36%	71 Missing and 1 partial :warning:
database/database.go	0.00%	39 Missing :warning:
admin-app/image.go	72.13%	14 Missing and 3 partials :warning:
admin-app/post.go	36.00%	16 Missing :warning:
tests/mocks/mocks.go	75.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #64 +/- ## ========================================== - Coverage 41.68% 41.09% -0.60% ========================================== Files 15 18 +3 Lines 758 876 +118 ========================================== + Hits 316 360 +44 - Misses 404 476 +72 - Partials 38 40 +2 ```

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[matheusgomes28]

Issues spawned from this work are #65 and #66

[AlDu2407]

I added the required functionality to the app. Also, refactored the GET image endpoint in the admin app. Improved the handling of the NavBar.

Hope this is fine for you.