Cleaned up markdown pipeline example http://tank.hyperfiddle.com/:dustingetz!markdown-pipeline/

Tank improvement: anything in the tank can be accessed through the "demo" subdomain as well – all the fiddles will be interactive when accessed through "demo". This is a temporary fix until fiddle cloning lands

For example: http://demo.hyperfiddle.net/:dustingetz!markdown-pipeline/#

There is an issue with the login wall on demo, dealing with it

demo looks good for me, no login issues

Login issues fixed on demo