created a function to calculate and visualize phenotypic and genetic correlations

conducts mantel test to examine correlation between phenotypic and
genetic correlations. (but is this the best method?)
added ordination theme and put more detail in heatmap figure for pheno_geno_correlations
update ggplot themes, heatmap correlations, making a pretty table for ANOVAs, and saving the multiplot function in R
update community explorer with heatmap of community