RFR: Remove unused files

[Iris Clark]

On Thu, 12 May 2022 19:57:18 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> Jesper asked me to remove those files :). If I do this before splitting index.md, that patch gets easier.

src/codeReview.md line 1:

> 1: % Community Code Review

The contents of this file was never integrated into the Guide so I don't think it should be removed quite yet.

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PR: https://git.openjdk.java.net/guide/pull/83