Remove qt5-default from Documentation Build

[pulsipher]

No description provided.

[codecov]

Codecov Report

Merging #299 (8db821f) into master (5989fed) will decrease coverage by 55.04%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #299       +/-   ##
===========================================
- Coverage   99.77%   44.73%   -55.05%     
===========================================
  Files          33       33               
  Lines        7084     6955      -129     
===========================================
- Hits         7068     3111     -3957     
- Misses         16     3844     +3828     

Impacted Files	Coverage Δ
src/results.jl	0.00% <0.00%> (-100.00%)	⬇️
src/measures.jl	0.00% <0.00%> (-100.00%)	⬇️
src/objective.jl	0.00% <0.00%> (-100.00%)	⬇️
src/measure_expansions.jl	0.00% <0.00%> (-100.00%)	⬇️
src/TranscriptionOpt/measures.jl	0.00% <0.00%> (-100.00%)	⬇️
src/TranscriptionOpt/optimize.jl	0.00% <0.00%> (-100.00%)	⬇️
src/MeasureToolbox/support_sums.jl	0.00% <0.00%> (-100.00%)	⬇️
src/TranscriptionOpt/transcribe.jl	0.00% <0.00%> (-99.74%)	⬇️
src/MeasureToolbox/integrals.jl	0.46% <0.00%> (-99.54%)	⬇️
src/nlp.jl	0.78% <0.00%> (-98.65%)	⬇️
... and 17 more

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[pulsipher]

This fixes the documentation build problem. The other failed tests are fixed by #298.