🚀 Suggested Installation Docs update for Ubuntu

[JWCS]

Every package manager has git-delta... except ubuntu. But, having used https://github.com/wagoodman/dive before, they have a smart installation suggestion for their latest debs. I tried it out for delta, and it worked pretty slick, low fuss. I've reproduced it below.

DELTA_VERSION=$(curl -sL "https://api.github.com/repos/dandavison/delta/releases/latest" | awk -F\" '/"tag_name":/{print $(NF-1)}')
mkdir -p ~/Downloads && cd ~/Downloads
# Replace 'git-delta' below with 'git-delta-musl' for musl
curl -OL https://github.com/dandavison/delta/releases/download/${DELTA_VERSION}/git-delta_${DELTA_VERSION}_amd64.deb
sudo apt install ./git-delta_${DELTA_VERSION}_amd64.deb
cd -