Use smart variables in the documentation #304
Description
This is something that is very common in large content management systems, but sigh...
We need a way to insert variables into documentation and easily update the text in one place and have it propagate.
This kind of thing is commonly used for a product name or something that might change over time, or during the development cycle. Longer text strings are often known as conrefs.
Right now, I need it for a base URL for the search demo site. I ended up doing a find and replace throughout the whole project. See pelias/documentation#195