Add option treat_markdown_warnings_as_error which throws an error when encountering a markdown/interpolation warning

Author: aaruni96

src/html/HTMLWriter.jl

@@ -2441,9 +2441,9 @@ function domify(dctx::DCtx, ::Node, e::MarkdownAST.JuliaValue)
         Unexpected Julia interpolation in the Markdown. This probably means that you have an
         unbalanced or un-escaped \$ in the text.
 
-        To write the dollar sign, escape it with `\\\$`
+            To write the dollar sign, escape it with `\\\$`
 
-        We don't have the file or line number available, but we got given the value:
+            We don't have the file or line number available, but we got given the value:
 
         `$(e.ref)` which is of type `$(typeof(e.ref))`
     """