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`.

2011/index.html

@@ -183,29 +183,28 @@ Entries of 2011 - The 20th IOCCC</h1>
 <p><strong>Download IOCCC</strong> <a
 href="2011/ioccc.2011.tar.bz2">2011 entry source</a></p>
 <ul>
-<li><a href="2011/akari/index.html">2011/akari</a> - Best of Show - Most
+<li><a href="akari/index.html">2011/akari</a> - Best of Show - Most
 Shrinkable</li>
-<li><a href="2011/blakely/index.html">2011/blakely</a> - Most
-devolving</li>
-<li><a href="2011/borsanyi/index.html">2011/borsanyi</a> - Best data
+<li><a href="blakely/index.html">2011/blakely</a> - Most devolving</li>
+<li><a href="borsanyi/index.html">2011/borsanyi</a> - Best data
 utility</li>
-<li><a href="2011/dlowe/index.html">2011/dlowe</a> - Most self
+<li><a href="dlowe/index.html">2011/dlowe</a> - Most self
 deprecating</li>
-<li><a href="2011/eastman/index.html">2011/eastman</a> - Best ball</li>
-<li><a href="2011/fredriksson/index.html">2011/fredriksson</a> - Most
+<li><a href="eastman/index.html">2011/eastman</a> - Best ball</li>
+<li><a href="fredriksson/index.html">2011/fredriksson</a> - Most
 useful</li>
-<li><a href="2011/goren/index.html">2011/goren</a> - Most artistic</li>
-<li><a href="2011/hamaji/index.html">2011/hamaji</a> - Best solved
+<li><a href="goren/index.html">2011/goren</a> - Most artistic</li>
+<li><a href="hamaji/index.html">2011/hamaji</a> - Best solved
 puzzle</li>
-<li><a href="2011/hou/index.html">2011/hou</a> - Best self documenting
+<li><a href="hou/index.html">2011/hou</a> - Best self documenting
 program</li>
-<li><a href="2011/konno/index.html">2011/konno</a> - Best one liner</li>
-<li><a href="2011/richards/index.html">2011/richards</a> - Most
-surprisingly portable</li>
-<li><a href="2011/toledo/index.html">2011/toledo</a> - Best non-chess
+<li><a href="konno/index.html">2011/konno</a> - Best one liner</li>
+<li><a href="richards/index.html">2011/richards</a> - Most surprisingly
+portable</li>
+<li><a href="toledo/index.html">2011/toledo</a> - Best non-chess
 game</li>
-<li><a href="2011/vik/index.html">2011/vik</a> - Most sound</li>
-<li><a href="2011/zucker/index.html">2011/zucker</a> - Most shiny</li>
+<li><a href="vik/index.html">2011/vik</a> - Most sound</li>
+<li><a href="zucker/index.html">2011/zucker</a> - Most shiny</li>
 </ul>
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