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`.

2004/index.html

@@ -189,34 +189,32 @@ Entries of 2004 - The 17th IOCCC</h1>
 <p><strong>Download IOCCC</strong> <a
 href="2004/ioccc.2004.tar.bz2">2004 entry source</a></p>
 <ul>
-<li><a href="2004/anonymous/index.html">2004/anonymous</a> - “Best use
+<li><a href="anonymous/index.html">2004/anonymous</a> - “Best use
 of”“Precious”” Lines”</li>
-<li><a href="2004/arachnid/index.html">2004/arachnid</a> - Best use of
+<li><a href="arachnid/index.html">2004/arachnid</a> - Best use of
 Vision</li>
-<li><a href="2004/burley/index.html">2004/burley</a> - Best Calculated
+<li><a href="burley/index.html">2004/burley</a> - Best Calculated
 Risk</li>
-<li><a href="2004/gavare/index.html">2004/gavare</a> - Best Use of Light
-and Spheres</li>
-<li><a href="2004/gavin/index.html">2004/gavin</a> - Best of Show</li>
-<li><a href="2004/hibachi/index.html">2004/hibachi</a> - Best Abuse of
-the Guidelines</li>
-<li><a href="2004/hoyle/index.html">2004/hoyle</a> - Most Functional
+<li><a href="gavare/index.html">2004/gavare</a> - Best Use of Light and
+Spheres</li>
+<li><a href="gavin/index.html">2004/gavin</a> - Best of Show</li>
+<li><a href="hibachi/index.html">2004/hibachi</a> - Best Abuse of the
+Guidelines</li>
+<li><a href="hoyle/index.html">2004/hoyle</a> - Most Functional
 Output</li>
-<li><a href="2004/jdalbec/index.html">2004/jdalbec</a> - Best Abuse of
-the Periodic Table</li>
-<li><a href="2004/kopczynski/index.html">2004/kopczynski</a> - Best
+<li><a href="jdalbec/index.html">2004/jdalbec</a> - Best Abuse of the
+Periodic Table</li>
+<li><a href="kopczynski/index.html">2004/kopczynski</a> - Best
 One-Liner</li>
-<li><a href="2004/newbern/index.html">2004/newbern</a> - Best Font
+<li><a href="newbern/index.html">2004/newbern</a> - Best Font
 Engine</li>
-<li><a href="2004/omoikane/index.html">2004/omoikane</a> - Best
-Utility</li>
-<li><a href="2004/schnitzi/index.html">2004/schnitzi</a> - Best Non-Use
-of Curses</li>
-<li><a href="2004/sds/index.html">2004/sds</a> - Best Abuse of
+<li><a href="omoikane/index.html">2004/omoikane</a> - Best Utility</li>
+<li><a href="schnitzi/index.html">2004/schnitzi</a> - Best Non-Use of
+Curses</li>
+<li><a href="sds/index.html">2004/sds</a> - Best Abuse of
 Indentation</li>
-<li><a href="2004/vik1/index.html">2004/vik1</a> - Best X11 Game</li>
-<li><a href="2004/vik2/index.html">2004/vik2</a> - Best Abuse of
-CPP</li>
+<li><a href="vik1/index.html">2004/vik1</a> - Best X11 Game</li>
+<li><a href="vik2/index.html">2004/vik2</a> - Best Abuse of CPP</li>
 </ul>
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