RFR: Introducing markdown

[Jesper Wilhelmsson]

Thank you for your review!
/Jesper

> On 10 May 2020, at 02:58, Iris Clark <iris at openjdk.java.net> wrote:
> 
> On Sat, 9 May 2020 04:06:51 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:
> 
>> Converted all html files to markdown and added a makefile to build the html.
> 
> Fantastic!  Modern markup!
> 
> -------------
> 
> Marked as reviewed by iris (Reviewer).
> 
> PR: https://git.openjdk.java.net/guide/pull/3