RFR: Remove empty files

[Iris Clark]

On Tue, 7 Dec 2021 21:23:26 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> The guide was merged into one file a year ago and since then all the old files has been in place with a forward link to the new single file. I think a year is long enough. This change removes all those forward files.

Super!  Thanks for remembering to remove after a suitable transition period.

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Marked as reviewed by iris (Reviewer).

PR: https://git.openjdk.java.net/guide/pull/68