Add scroll bar to the main widget

[IgorTatarnikov]

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Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
Unexpected behaviour when widget is larger than the current window size.

What does this PR do?
Wraps the core widget in a QScrollArea allowing scrolling in smaller window sizes.

References

closes #67

How has this PR been tested?

Tested locally by visual inspection on 13" screen.

Is this a breaking change?

No

Does this PR require an update to the documentation?

No

Checklist:

• The code has been tested locally
• The code has been formatted with pre-commit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.09%. Comparing base (6344010) to head (7d486d6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
+ Coverage   82.00%   82.09%   +0.09%     
==========================================
  Files           9        9              
  Lines         589      592       +3     
==========================================
+ Hits          483      486       +3     
  Misses        106      106              

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