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`.

1994/index.html

@@ -245,25 +245,23 @@ Entries of 1994 - The 11th IOCCC</h1>
 <p><strong>Download IOCCC</strong> <a
 href="1994/ioccc.1994.tar.bz2">1994 entry source</a></p>
 <ul>
-<li><a href="1994/dodsond1/index.html">1994/dodsond1</a> - Best
-Game</li>
-<li><a href="1994/dodsond2/index.html">1994/dodsond2</a> - Most
-Obfuscated Packaging</li>
-<li><a href="1994/horton/index.html">1994/horton</a> - Best Utility</li>
-<li><a href="1994/imc/index.html">1994/imc</a> - Most Obfuscated
+<li><a href="dodsond1/index.html">1994/dodsond1</a> - Best Game</li>
+<li><a href="dodsond2/index.html">1994/dodsond2</a> - Most Obfuscated
+Packaging</li>
+<li><a href="horton/index.html">1994/horton</a> - Best Utility</li>
+<li><a href="imc/index.html">1994/imc</a> - Most Obfuscated
 Algorithm</li>
-<li><a href="1994/ldb/index.html">1994/ldb</a> - Best One-liner</li>
-<li><a href="1994/schnitzi/index.html">1994/schnitzi</a> - Best
-Layout</li>
-<li><a href="1994/shapiro/index.html">1994/shapiro</a> - Most Well
-Rounded Obfuscation</li>
-<li><a href="1994/smr/index.html">1994/smr</a> - Worst Abuse of the
+<li><a href="ldb/index.html">1994/ldb</a> - Best One-liner</li>
+<li><a href="schnitzi/index.html">1994/schnitzi</a> - Best Layout</li>
+<li><a href="shapiro/index.html">1994/shapiro</a> - Most Well Rounded
+Obfuscation</li>
+<li><a href="smr/index.html">1994/smr</a> - Worst Abuse of the
 Rules</li>
-<li><a href="1994/tvr/index.html">1994/tvr</a> - Best X11 Program</li>
-<li><a href="1994/weisberg/index.html">1994/weisberg</a> - Best Short
+<li><a href="tvr/index.html">1994/tvr</a> - Best X11 Program</li>
+<li><a href="weisberg/index.html">1994/weisberg</a> - Best Short
 Program</li>
-<li><a href="1994/westley/index.html">1994/westley</a> - Worst Abuse of
-the C Preprocessor</li>
+<li><a href="westley/index.html">1994/westley</a> - Worst Abuse of the C
+Preprocessor</li>
 </ul>
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