Remove link to severly outdated asset plugin (#6613)
Remove link to severly outdated asset plugin (#6613)

Merge pull request 6613
fulldecent/jekyll,tillgrallert/jekyll,jekyll/jekyll,Strangehill/jekyll,x-way/jekyll,gencer/jekyll,ryanshaw/jekyll,jaybe-jekyll/jekyll,Strangehill/jekyll,x-way/jekyll,getandpost/jekyll.github.io,fulldecent/jekyll,yhironaka/yhironaka.github.io,getandpost/jekyll.github.io,x-way/jekyll,x-way/jekyll,Strangehill/jekyll,gencer/jekyll,gencer/jekyll,tillgrallert/jekyll,tillgrallert/jekyll,jaybe-jekyll/jekyll,jekyll/jekyll,getandpost/jekyll.github.io,ryanshaw/jekyll,chrisfinazzo/jekyll,jekyll/jekyll,jaybe-jekyll/jekyll,fulldecent/jekyll,fulldecent/jekyll,chrisfinazzo/jekyll,jaybe-jekyll/jekyll,chrisfinazzo/jekyll,Strangehill/jekyll,ryanshaw/jekyll,chrisfinazzo/jekyll,tillgrallert/jekyll,tillgrallert/jekyll,gencer/jekyll,jekyll/jekyll,Strangehill/jekyll,ryanshaw/jekyll,gencer/jekyll