RFR: Improve and modernize the makefile

Tue Mar 16 14:13:20 UTC 2021

On Tue, 16 Mar 2021 13:22:55 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> Note that with this change, the build result end up in `build/dist`, rather than `build` directly. Deployment scripts will likely need adaption to this change. 
>> 
>> The new directory `build/support` contains intermediate results that are needed by the build.
>
> I don't mind this change but I think it may be slightly premature as the chapters aren't nearly as stable as one might think :-)
> The GIT rewrite will change things a lot. I would prefer to hold this change until that's done.

Actually, I thought of this as a pre-requirement for the git rewrite... I started writing but just got lost in this huge index.md file.

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PR: https://git.openjdk.java.net/guide/pull/46