"$" in markdown is busted

[bitspittle]

The following markdown will get wrecked when Kobweb tries to convert it to Kotlin

 Uh oh: $test

 ```
 also dollars
 in code blocks like
 $test
 also cause major issues
 ```

We should substitute out those dollar signs, but not ones in {{{ ... }}} blocks.

[bitspittle]

Will be fixed in 0.9.15