chore(latexmkrc): removed file due to no longer using lhs

.latexmkrc

@@ -1,17 +0,0 @@
-# Use subroutine to do preprocessing and running pdflatex
-$pdflatex = 'internal mylatex %B %O';
-sub mylatex {
-  my $base = shift @_;
-  my $tex = "$base.tex";
-
-  # Run the preprocessor
-  if (-e "$base.lhs" && `which lhs2TeX` ne "") {
-    # Run the preprocessor
-    system('lhs2TeX', '--poly', '-o', $tex, "$base.lhs") == 0 or return $?;
-  }
-  # Run pdflatex
-  my $return = system('pdflatex', @_, $tex);
-  system "echo INPUT $base.lhs >> $aux_dir1$base.fls";
-  return $return;
-}
-