Fix yay-bin being checked out to $HOME instead of /tmp and not getting cleaned up

Co-author: @bbondier
Closes #86

install/1-yay.sh

@@ -1,9 +1,11 @@
 sudo pacman -S --needed --noconfirm base-devel
 
 if ! command -v yay &>/dev/null; then
+  cd /tmp
   git clone https://aur.archlinux.org/yay-bin.git
   cd yay-bin
   makepkg -si --noconfirm
-  cd ~
+  cd -
   rm -rf yay-bin
+  cd ~
 fi