Enhance welcome header

[olistic]

Closes #74

[codecov-io]

Codecov Report

Merging #191 into master will increase coverage by 0.02%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master     #191      +/-   ##
==========================================
+ Coverage   92.25%   92.27%   +0.02%     
==========================================
  Files          85       86       +1     
  Lines        1071     1075       +4     
  Branches      179      179              
==========================================
+ Hits          988      992       +4     
  Misses         68       68              
  Partials       15       15

Impacted Files	Coverage Δ
packages/warriorjs-cli/src/Game.js	50.68% <0%> (ø)	⬆️
...ackages/warriorjs-cli/src/ui/printWelcomeHeader.js	100% <100%> (ø)

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