add `plugins` for multiple page pagination (#6055)
add `plugins` for multiple page pagination (#6055)

Merge pull request 6055
jekyll/jekyll,tomjohnson1492/jekyll,gencer/jekyll,ryanshaw/jekyll,chrisfinazzo/jekyll,tillgrallert/jekyll,gencer/jekyll,x-way/jekyll,chrisfinazzo/jekyll,gencer/jekyll,gencer/jekyll,chrisfinazzo/jekyll,fulldecent/jekyll,jekyll/jekyll,x-way/jekyll,gencer/jekyll,tomjohnson1492/jekyll,Strangehill/jekyll,yhironaka/yhironaka.github.io,Strangehill/jekyll,tillgrallert/jekyll,tillgrallert/jekyll,fulldecent/jekyll,tomjohnson1492/jekyll,jekyll/jekyll,jaybe-jekyll/jekyll,Strangehill/jekyll,getandpost/jekyll.github.io,jaybe-jekyll/jekyll,fulldecent/jekyll,fulldecent/jekyll,tomjohnson1492/jekyll,ryanshaw/jekyll,getandpost/jekyll.github.io,tillgrallert/jekyll,alex-kovac/jekyll,ryanshaw/jekyll,alex-kovac/jekyll,x-way/jekyll,alex-kovac/jekyll,Strangehill/jekyll,chrisfinazzo/jekyll,getandpost/jekyll.github.io,alex-kovac/jekyll,jaybe-jekyll/jekyll,tillgrallert/jekyll,jaybe-jekyll/jekyll,alex-kovac/jekyll,Strangehill/jekyll,jekyll/jekyll,tomjohnson1492/jekyll,x-way/jekyll,ryanshaw/jekyll