Fix backup error on install script when backups already exist

scripts/install

@@ -1,14 +1,17 @@
 #!/bin/bash
 
 if [ -f "$HOME/.vimrc" ]; then
+    rm -rf $HOME/vimrc.old 2>&1
     mv $HOME/.vimrc $HOME/vimrc.old
     echo "There was already a .vimrc file, renamed to vimrc.old"
 fi
 if [ -d "$HOME/.vim" ]; then
+    rm -rf $HOME/vim.old 2>&1
     mv $HOME/.vim $HOME/vim.old
     echo "There was already a .vim folder, renamed to vim.old"
 fi
 if [ -f "$HOME/.gvimrc" ]; then
+    rm -rf $HOME/gvimrc.old 2>&1
     mv $HOME/.gvimrc $HOME/gvimrc.old
     echo "There was already a .gvimrc file, renamed to gvimrc.old"
 fi