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`.

1993/index.html

@@ -184,25 +184,22 @@ Entries of 1993 - The 10th IOCCC</h1>
 <p><strong>Download IOCCC</strong> <a
 href="1993/ioccc.1993.tar.bz2">1993 entry source</a></p>
 <ul>
-<li><a href="1993/ant/index.html">1993/ant</a> - Best Utility</li>
-<li><a href="1993/cmills/index.html">1993/cmills</a> - Bill Gates
-Award</li>
-<li><a href="1993/dgibson/index.html">1993/dgibson</a> - Best Abuse of
-the C Preprocessor</li>
-<li><a href="1993/ejb/index.html">1993/ejb</a> - Best Obfuscated
+<li><a href="ant/index.html">1993/ant</a> - Best Utility</li>
+<li><a href="cmills/index.html">1993/cmills</a> - Bill Gates Award</li>
+<li><a href="dgibson/index.html">1993/dgibson</a> - Best Abuse of the C
+Preprocessor</li>
+<li><a href="ejb/index.html">1993/ejb</a> - Best Obfuscated
 Algorithm</li>
-<li><a href="1993/jonth/index.html">1993/jonth</a> - Most Obfuscated X
+<li><a href="jonth/index.html">1993/jonth</a> - Most Obfuscated X
 Program</li>
-<li><a href="1993/leo/index.html">1993/leo</a> - Best Game</li>
-<li><a href="1993/lmfjyh/index.html">1993/lmfjyh</a> - Most Versatile
+<li><a href="leo/index.html">1993/leo</a> - Best Game</li>
+<li><a href="lmfjyh/index.html">1993/lmfjyh</a> - Most Versatile
 Source</li>
-<li><a href="1993/plummer/index.html">1993/plummer</a> - Best One
-Liner</li>
-<li><a href="1993/rince/index.html">1993/rince</a> - Most Well
-Rounded</li>
-<li><a href="1993/schnitzi/index.html">1993/schnitzi</a> - Obfuscated
+<li><a href="plummer/index.html">1993/plummer</a> - Best One Liner</li>
+<li><a href="rince/index.html">1993/rince</a> - Most Well Rounded</li>
+<li><a href="schnitzi/index.html">1993/schnitzi</a> - Obfuscated
 Intelligence Award</li>
-<li><a href="1993/vanb/index.html">1993/vanb</a> - Most Irregular
+<li><a href="vanb/index.html">1993/vanb</a> - Most Irregular
 Expression</li>
 </ul>
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