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`.

2006/index.html

@@ -184,33 +184,26 @@ Entries of 2006 - The 19th IOCCC</h1>
 <p><strong>Download IOCCC</strong> <a
 href="2006/ioccc.2006.tar.bz2">2006 entry source</a></p>
 <ul>
-<li><a href="2006/birken/index.html">2006/birken</a> - EDAMAME
-Award</li>
-<li><a href="2006/borsanyi/index.html">2006/borsanyi</a> - Most
-Useful</li>
-<li><a href="2006/grothe/index.html">2006/grothe</a> - Most Obfuscated
+<li><a href="birken/index.html">2006/birken</a> - EDAMAME Award</li>
+<li><a href="borsanyi/index.html">2006/borsanyi</a> - Most Useful</li>
+<li><a href="grothe/index.html">2006/grothe</a> - Most Obfuscated
 Audio</li>
-<li><a href="2006/hamre/index.html">2006/hamre</a> - Most
-Irrational</li>
-<li><a href="2006/meyer/index.html">2006/meyer</a> - Best Game</li>
-<li><a href="2006/monge/index.html">2006/monge</a> - Best Compiled
+<li><a href="hamre/index.html">2006/hamre</a> - Most Irrational</li>
+<li><a href="meyer/index.html">2006/meyer</a> - Best Game</li>
+<li><a href="monge/index.html">2006/monge</a> - Best Compiled
 Graphics</li>
-<li><a href="2006/night/index.html">2006/night</a> - Best Abuse of
+<li><a href="night/index.html">2006/night</a> - Best Abuse of
 Computation</li>
-<li><a href="2006/sloane/index.html">2006/sloane</a> - Homer’’s
-Favorite</li>
-<li><a href="2006/stewart/index.html">2006/stewart</a> - Best Computed
+<li><a href="sloane/index.html">2006/sloane</a> - Homer’’s Favorite</li>
+<li><a href="stewart/index.html">2006/stewart</a> - Best Computed
 Graphics</li>
-<li><a href="2006/sykes1/index.html">2006/sykes1</a> - Best
-Assembler</li>
-<li><a href="2006/sykes2/index.html">2006/sykes2</a> - Best One
-Liner</li>
-<li><a href="2006/toledo1/index.html">2006/toledo1</a> - Best Small
+<li><a href="sykes1/index.html">2006/sykes1</a> - Best Assembler</li>
+<li><a href="sykes2/index.html">2006/sykes2</a> - Best One Liner</li>
+<li><a href="toledo1/index.html">2006/toledo1</a> - Best Small
 Program</li>
-<li><a href="2006/toledo2/index.html">2006/toledo2</a> - Best of
-Show</li>
-<li><a href="2006/toledo3/index.html">2006/toledo3</a> - Most Portable
-Chess Set</li>
+<li><a href="toledo2/index.html">2006/toledo2</a> - Best of Show</li>
+<li><a href="toledo3/index.html">2006/toledo3</a> - Most Portable Chess
+Set</li>
 </ul>
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