docs: add short serve command for livereload (#7919)
docs: add short serve command for livereload (#7919)

Merge pull request 7919
x-way/jekyll,jekyll/jekyll,fulldecent/jekyll,ryanshaw/jekyll,ryanshaw/jekyll,jaybe-jekyll/jekyll,x-way/jekyll,jaybe-jekyll/jekyll,jekyll/jekyll,jekyll/jekyll,jekyll/jekyll,x-way/jekyll,fulldecent/jekyll,ryanshaw/jekyll,tillgrallert/jekyll,chrisfinazzo/jekyll,jaybe-jekyll/jekyll,chrisfinazzo/jekyll,fulldecent/jekyll,chrisfinazzo/jekyll,chrisfinazzo/jekyll,tillgrallert/jekyll,x-way/jekyll,fulldecent/jekyll,jaybe-jekyll/jekyll,ryanshaw/jekyll,yhironaka/yhironaka.github.io,tillgrallert/jekyll,tillgrallert/jekyll,tillgrallert/jekyll