RFR: Joined the guide into a single file

[Jesper Wilhelmsson]

On Thu, 15 Oct 2020 17:18:36 GMT, Iris Clark <iris at openjdk.org> wrote:

>> I have left a forwarding pointer in the old files in case anyone has a link to the guide somewhere. Not sure if this is
>> needed. Maybe it's better to just remove all the files directly?
>> I did remove jbslabels.md since that file hasn't been published on the web server yet.
>> 
>> I didn't make any changes in the content except for removing references to getSource.md, hgHelp.md, and tClone.md since
>> they are outdated and shouldn't be inlined in the guide. I also removed all TBD and sections with no content. Notes has
>> been added in the todo list in README.md for all sections and TBDs that was removed.
>
> Nice consolidation!  As far as I can tell, all of the relevant text has been retained.  As expected, most deletions are
> structural (navigation, line breaks) and a few empty sections are deleted.

Thank you for the reviews Stuart and Iris!

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PR: https://git.openjdk.java.net/guide/pull/28