build missing HTML files for entries

Setup a simple topnav for missing HTML files for entries.

Added `bin/gen-other-html.sh` to build entry HTML files from
markdown other than README.md to index.html HTML files.

Fixed duplicate link text in `2020/ferguson1/gameplay.md`.

Improved `inc/md2html.cfg` to support building the missing HTML
files for entries.

Added `make gen_other_html` to top level Makefile.
Added `make gen_other_html` to `make quick_www` and `make www`.

Fixed inventory links for year level index.html files.
Changed `bin/output-year-index.sh` VERSION from "1.0.1 2024-02-23"
to "1.1 2024-02-27".

Added missing lines in `manifest.numbers`.  Update the affected
`.entry.json` files.

The manifest (in both `manifest.numbers` and the collection of
manifests from of all entry `.entry.json` files) now match.  Errors
from `make verify_entry_files` will now abort both `make quick_www`
and `make www` rules in the top level `Makefile`.

Changed markdown files in manifest to have an _inventory_order_ of
_2000000000_ so that the `index.html` file will usually appear at
the start of the _Secondary files_ set for the "#inventory" section
of an entry's `index.html` file.

Changed compressed tar files (files that end in _.tar.bz2_) in
manifest to have an _inventory_order_ of _100000_ so that these
files will usually appear at the end of the _Primary files_ set for
the "#inventory" section of an entry's `index.html` file.

Added 'Jump to top` link above the _Primary files_ section.
Changed `bin/output-index-inventory.sh` VERSION from "1.1.1 2024-02-23"
to "1.2 2024-02-27".

Updated HTML files to perform the above via `make www`.

2019/index.html

@@ -194,33 +194,31 @@ Entries of 2019 - The 26th IOCCC</h1>
 <p><strong>Download IOCCC</strong> <a
 href="2019/ioccc.2019.tar.bz2">2019 entry source</a></p>
 <ul>
-<li><a href="2019/adamovsky/index.html">2019/adamovsky</a> - Most
-functional interpreter</li>
-<li><a href="2019/burton/index.html">2019/burton</a> - Best
-one-liner</li>
-<li><a href="2019/ciura/index.html">2019/ciura</a> - Most
-alphabetic</li>
-<li><a href="2019/diels-grabsch1/index.html">2019/diels-grabsch1</a> -
-Best small program</li>
-<li><a href="2019/diels-grabsch2/index.html">2019/diels-grabsch2</a> -
-Most self-aware</li>
-<li><a href="2019/dogon/index.html">2019/dogon</a> - Best use of space
-and time</li>
-<li><a href="2019/duble/index.html">2019/duble</a> - Best collaborative
+<li><a href="adamovsky/index.html">2019/adamovsky</a> - Most functional
+interpreter</li>
+<li><a href="burton/index.html">2019/burton</a> - Best one-liner</li>
+<li><a href="ciura/index.html">2019/ciura</a> - Most alphabetic</li>
+<li><a href="diels-grabsch1/index.html">2019/diels-grabsch1</a> - Best
+small program</li>
+<li><a href="diels-grabsch2/index.html">2019/diels-grabsch2</a> - Most
+self-aware</li>
+<li><a href="dogon/index.html">2019/dogon</a> - Best use of space and
+time</li>
+<li><a href="duble/index.html">2019/duble</a> - Best collaborative
 graphics</li>
-<li><a href="2019/endoh/index.html">2019/endoh</a> - Most in need of
+<li><a href="endoh/index.html">2019/endoh</a> - Most in need of
 debugging</li>
-<li><a href="2019/giles/index.html">2019/giles</a> - Most in need of
-wide space</li>
-<li><a href="2019/karns/index.html">2019/karns</a> - Most in need of
+<li><a href="giles/index.html">2019/giles</a> - Most in need of wide
+space</li>
+<li><a href="karns/index.html">2019/karns</a> - Most in need of
 whitespace</li>
-<li><a href="2019/lynn/index.html">2019/lynn</a> - Most functional
+<li><a href="lynn/index.html">2019/lynn</a> - Most functional
 compiler</li>
-<li><a href="2019/mills/index.html">2019/mills</a> - Most in need to be
+<li><a href="mills/index.html">2019/mills</a> - Most in need to be
 tweeted</li>
-<li><a href="2019/poikola/index.html">2019/poikola</a> - Most
+<li><a href="poikola/index.html">2019/poikola</a> - Most
 calendrical</li>
-<li><a href="2019/yang/index.html">2019/yang</a> - Most in need of
+<li><a href="yang/index.html">2019/yang</a> - Most in need of
 transparency</li>
 </ul>
 <p> <strong>Jump to:</strong> <a href="#">top</a></p>