Update links to hosted version of makerstrap in examples/docs

[k88hudson]

Anything that has a link like this:

<link href="https://s3-us-west-2.amazonaws.com/makerstrap/makerstrap.complete.min.css" rel="stylesheet">

Needs to be updated to use our new automatically updated version on stuff.webmaker.org:

<link href="https://stuff.webmaker.org/makerstrap/latest/makerstrap.complete.min.css" rel="stylesheet">

Also, we should note that all versions are available at

https://stuff.webmaker.org/makerstrap/v{{version}}/makerstrap.complete.min.css

[mlveis]

updated the link