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`.

1984/index.html

@@ -156,12 +156,11 @@ Entries of 1984 - The 1st IOCCC</h1>
 <p><strong>Download IOCCC</strong> <a
 href="1984/ioccc.1984.tar.bz2">1984 entry source</a></p>
 <ul>
-<li><a href="1984/anonymous/index.html">1984/anonymous</a> -
-Dishonorable mention</li>
-<li><a href="1984/decot/index.html">1984/decot</a> - Second place</li>
-<li><a href="1984/laman/index.html">1984/laman</a> - Third place</li>
-<li><a href="1984/mullender/index.html">1984/mullender</a> - Grand
-Prize</li>
+<li><a href="anonymous/index.html">1984/anonymous</a> - Dishonorable
+mention</li>
+<li><a href="decot/index.html">1984/decot</a> - Second place</li>
+<li><a href="laman/index.html">1984/laman</a> - Third place</li>
+<li><a href="mullender/index.html">1984/mullender</a> - Grand Prize</li>
 </ul>
 <p> <strong>Jump to:</strong> <a href="#">top</a></p>