chore: remove splashscreen.js

[brenopolanski]

Summary

The splashscreen.js file not is necessary more. All code is in: src/main/index.js.

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #1698 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1698   +/-   ##
========================================
  Coverage    63.87%   63.87%           
========================================
  Files          139      139           
  Lines         3815     3815           
  Branches       797      797           
========================================
  Hits          2437     2437           
  Misses        1152     1152           
  Partials       226      226

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