Feat/10 image display

[jb3rndt]

Closes #10

Changes made by this Pull Request

• Displays an image on the website
• image gets served by the backend
• image folder is ~/.annoto

Definition of Done

• [x] Tests are written and run successful
• [x] Code is documented
• [x] User Manual is updated
• [x] All requirements of the user story are met

[codecov-commenter]

Codecov Report

Merging #23 (a444d9c) into dev (c382aeb) will decrease coverage by 12.50%. The diff coverage is 87.50%.

@@             Coverage Diff              @@
##               dev      #23       +/-   ##
============================================
- Coverage   100.00%   87.50%   -12.50%     
============================================
  Files            2        2               
  Lines            6       24       +18     
============================================
+ Hits             6       21       +15     
- Misses           0        3        +3     

Impacted Files	Coverage Δ
api/app.py	78.57% <78.57%> (ø)
api/config.py	100.00% <100.00%> (ø)
api/tests/integration/test_integration.py
api/tests/unit/test_module.py

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