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`.

2001/index.html

@@ -197,31 +197,30 @@ Entries of 2001 - The 16th IOCCC</h1>
 <p><strong>Download IOCCC</strong> <a
 href="2001/ioccc.2001.tar.bz2">2001 entry source</a></p>
 <ul>
-<li><a href="2001/anonymous/index.html">2001/anonymous</a> -
-Dishonorable mention</li>
-<li><a href="2001/bellard/index.html">2001/bellard</a> - Best abuse of
-the rules</li>
-<li><a href="2001/cheong/index.html">2001/cheong</a> - Best short
+<li><a href="anonymous/index.html">2001/anonymous</a> - Dishonorable
+mention</li>
+<li><a href="bellard/index.html">2001/bellard</a> - Best abuse of the
+rules</li>
+<li><a href="cheong/index.html">2001/cheong</a> - Best short
 program</li>
-<li><a href="2001/coupard/index.html">2001/coupard</a> - Most obfuscated
+<li><a href="coupard/index.html">2001/coupard</a> - Most obfuscated
 sound</li>
-<li><a href="2001/ctk/index.html">2001/ctk</a> - Worst Driver</li>
-<li><a href="2001/dgbeards/index.html">2001/dgbeards</a> - Best AI</li>
-<li><a href="2001/herrmann1/index.html">2001/herrmann1</a> - Best abuse
-of the C preprocessor</li>
-<li><a href="2001/herrmann2/index.html">2001/herrmann2</a> - Most
+<li><a href="ctk/index.html">2001/ctk</a> - Worst Driver</li>
+<li><a href="dgbeards/index.html">2001/dgbeards</a> - Best AI</li>
+<li><a href="herrmann1/index.html">2001/herrmann1</a> - Best abuse of
+the C preprocessor</li>
+<li><a href="herrmann2/index.html">2001/herrmann2</a> - Most
 eye-crossing</li>
-<li><a href="2001/jason/index.html">2001/jason</a> - Best Of Show</li>
-<li><a href="2001/kev/index.html">2001/kev</a> - Best Curses Game</li>
-<li><a href="2001/ollinger/index.html">2001/ollinger</a> - Best of
-Show</li>
-<li><a href="2001/rosten/index.html">2001/rosten</a> - Best abuse of the
+<li><a href="jason/index.html">2001/jason</a> - Best Of Show</li>
+<li><a href="kev/index.html">2001/kev</a> - Best Curses Game</li>
+<li><a href="ollinger/index.html">2001/ollinger</a> - Best of Show</li>
+<li><a href="rosten/index.html">2001/rosten</a> - Best abuse of the
 user</li>
-<li><a href="2001/schweikh/index.html">2001/schweikh</a> - Best
+<li><a href="schweikh/index.html">2001/schweikh</a> - Best
 one-liner</li>
-<li><a href="2001/westley/index.html">2001/westley</a> - Best
+<li><a href="westley/index.html">2001/westley</a> - Best
 position-independent code</li>
-<li><a href="2001/williams/index.html">2001/williams</a> - Best Graphic
+<li><a href="williams/index.html">2001/williams</a> - Best Graphic
 Game</li>
 </ul>
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