Conflict between BugSigDBStats::getMostFrequentTaxa() and bugSigSimple::getMostFrequentTaxa()

[cmirzayi]

As see on this line: https://github.com/waldronlab/bugSigSimple/blob/89a204471baabb60e21c66363f6dfd15b75586cf/vignettes/c-section_meconium_shaimaa.Rmd#LL125C5-L125C5

The getMostFrequentTaxa() function in bugSigSimple should be removed and the vignettes updated.