Install git-prompt to LWS directory

scripts/git-prompt-install.sh

@@ -1,9 +1,8 @@
 #!/bin/bash
 
-# https://github.com/magicmonty/bash-git-prompt
-
 set -x
 set -u
 
-git clone https://github.com/magicmonty/bash-git-prompt.git ~/.bash-git-prompt --depth=1
+readonly REPO="https://github.com/magicmonty/bash-git-prompt.git"
 
+git clone "$REPO" "$GIT_PROMPT_PATH" --depth=1