Improve gitconfig and install script

install.lazygit.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+LAZYGIT_VERSION=$(curl -s "https://api.github.com/repos/jesseduffield/lazygit/releases/latest" | \grep -Po '"tag_name": *"v\K[^"]*')
+curl -Lo lazygit.tar.gz "https://github.com/jesseduffield/lazygit/releases/download/v${LAZYGIT_VERSION}/lazygit_${LAZYGIT_VERSION}_Linux_x86_64.tar.gz"
+
+tar xf lazygit.tar.gz lazygit
+sudo install lazygit -D -t /usr/local/bin/
+rm lazygit lazygit.tar.gz