format headers

We move `tmp/format-headers.sh` into `bin/format-headers.sh`.

We also add a few missing empty lines to `README.md`.

We add `bin/format-headers.sh` to the `bin/README.md`.

We run `bin/format-headers.sh` to perform the above.

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

bin/index.html

@@ -490,6 +490,12 @@ that is <strong>NOT</strong> an IOCCC markdown best practice.</p>
 details.</p>
 <p>We recommend that this tool be invoked via the top level <code>Makefile</code> by:</p>
 <pre><code>    make find_missing_links</code></pre>
+<div id="format-headers">
+<h3 id="format-headers.sh"><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/bin/format-headers.sh">format-headers.sh</a></h3>
+</div>
+<p>Format select headers and preceding empty lines in entry README.md files.</p>
+<p>Usage:</p>
+<pre><code>    bin/format-headers.sh</code></pre>
 <div id="gen-authors">
 <h3 id="gen-authors.sh"><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/bin/gen-authors.sh">gen-authors.sh</a></h3>
 </div>
@@ -628,14 +634,18 @@ inventory, see the <a href="../1984/anonymous/index.html#inventory">inventory in
 1984/anonymous</a>.</p>
 <p>This tool is used in the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/bin/md2html.cfg">bin/md2html.cfg</a> file as part of
 the <a href="index.html#md2html">md2html tool</a>.</p>
+<div id="output-year-index">
 <h3 id="output-year-index.sh"><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/bin/output-year-index.sh">output-year-index.sh</a></h3>
+</div>
 <p>Output the inventory for a given year’s winning entries in HTML form. In other
 words in <a href="../1984/index.html">1984</a> it would list, as links, the four winning
 entries, which you can see directly at <a href="../1984/index.html#inventory">1984
 inventory</a>.</p>
 <p>This tool is used in the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/bin/md2html.cfg">bin/md2html.cfg</a> file as part of
 the <a href="index.html#md2html">md2html tool</a>.</p>
+<div id="pandoc-wrapper">
 <h3 id="pandoc-wrapper.sh"><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/bin/pandoc-wrapper.sh">pandoc-wrapper.sh</a></h3>
+</div>
 <p>Wrapper tool to run <code>pandoc(1)</code>.</p>
 <div id="quick-readme2index">
 <h3 id="quick-readme2index.sh"><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/bin/quick-readme2index.sh">quick-readme2index.sh</a></h3>