no relative url example

[jim-mason-dmxio]

the cheat sheet does not show a relative url example
a full path url link will open in a separate window even if the a tag target="_self"
a relative url is needed to open a page in the same window.
there also does not appear to be a way to set or view the base url in the head section for markdown

[assemblebot]

@jim-mason-dmxio Thanks for the issue! If you're reporting a bug, please be sure to include:

• The version of assemble you are using.
• Your assemblefile.js (This can be in a gist)
• The commandline output. (Screenshot or gist is fine)
• What you expected to happen instead.