title: Use variable in markdown to represent url base
body: <p>I have a readme.md file, looks like this:</p>
  
  <pre><code>## Utility Methods
  &gt; Links to the documentation
  
  ### Control Flow
  
  * [Series](https://www.google.com/dingo)
  * [Parallel](https://www.google.com/fondue)
  * [Waterfall](https://www.google.com/ok)
  * [Inject](https://www.google.com/foop) - (most recommended)
  </code></pre>
  
  <p>I am looking to do something like this to make it more maintainable:</p>
  
  <pre><code>%url=https://www.google.com  # define variable?
  
  ## Utility Methods
  &gt; Links to the documentation
  
  ### Control Flow
  
  * [Series](%url/dingo)
  * [Parallel](%url/fondue)/[ParallelLimit](%url/sram) 
  * [Waterfall](%url/ok)
  * [Inject](%url/foop) - (most recommended)
  </code></pre>
  
  <p>As you can see I am trying to reduce the amount of times I repeat the url base. In reality my url-base is a lot longer than google.com, it's 3 or 4x longer so it's much worse.</p>