Change html img tag to markdown

Author: naupaka

episodes/01-r-basics.Rmd

@@ -219,7 +219,7 @@ but R is "not sure"
 about how to assign the name to "human\_ chr\_number" when the object name we
 want is "human\_chr\_number".
 
-<img src="fig/rstudio_script_warning.png" alt="rstudio script warning" style="width: 600px;"/>
+![RStudio script warning]("fig/rstudio_script_warning.png")
 
 ::::::::::::::::::::::::::::::::::::::::::::::::::