move non-README.md HTML formation to bin/othermd2html.sh

The core of `bin/gen-other-html.sh` code that converts entry non-README.md
into HTML has been moved into a new tool: `bin/othermd2html.sh`.

The `bin/othermd2html.sh` tool will be useful to the `bin/cvt-submission.sh`
tool that is under development.

Added info about `bin/othermd2html.sh` to `bin/README.md`.

Changed `bin/gen-other-html.sh` VERSION from "1.4.1 2024-08-18"
to "1.5 2024-08-27".

HTML produced by `bin/gen-other-html.sh` now uses a "jump to" mid-bar
test now shows the `YYYY/dir/index.html` link text (with `YYYY/dir/` added).

Performed `make gen_other_html` to accomplish the above and to test under macOS.
Performed `make gen_top_html` to accomplish the above and to test under macOS.

bin/index.html

@@ -785,6 +785,15 @@ markdown files (permanent markdown files or temporarily generated
 markdown files) and HTML fragments from the <a href="../inc/index.html">inc directory</a>.</p>
 <p>The <a href="index.html#md2html_cfg">md2html.cfg</a> configuration file is
 used by <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/bin/md2html.sh">md2html.sh</a> to drive the generation process.</p>
+<div id="othermd2html">
+<h3 id="othermd2html.sh"><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/bin/othermd2html.sh">othermd2html.sh</a></h3>
+</div>
+<p>Convert a non-README.md file in an entry to HTML.</p>
+<p>Usage:</p>
+<pre><code>    bin/othermd2html.sh YYYY/dir/pathto.md</code></pre>
+<p>For example:</p>
+<pre><code>    bin/othermd2html.sh -v 1 2020/ferguson1/chocolate-cake.md</code></pre>
+<p>The <a href="#othermd2html">othermd2html.sh</a> tool is used by <a href="#gen-other-html">gen-other-html.sh</a>.</p>
 <div id="output-index-author">
 <h3 id="output-index-author.sh"><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/bin/output-index-author.sh">output-index-author.sh</a></h3>
 </div>