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`.

2013/index.html

@@ -204,33 +204,31 @@ Entries of 2013 - The 22nd IOCCC</h1>
 <p><strong>Download IOCCC</strong> <a
 href="2013/ioccc.2013.tar.bz2">2013 entry source</a></p>
 <ul>
-<li><a href="2013/birken/index.html">2013/birken</a> - Best painting
+<li><a href="birken/index.html">2013/birken</a> - Best painting
 tool</li>
-<li><a href="2013/cable1/index.html">2013/cable1</a> - Most partisan
+<li><a href="cable1/index.html">2013/cable1</a> - Most partisan
 1-liner</li>
-<li><a href="2013/cable2/index.html">2013/cable2</a> - Best of show</li>
-<li><a href="2013/cable3/index.html">2013/cable3</a> - Largest small
-system emulator</li>
-<li><a href="2013/dlowe/index.html">2013/dlowe</a> - Best sparkling
+<li><a href="cable2/index.html">2013/cable2</a> - Best of show</li>
+<li><a href="cable3/index.html">2013/cable3</a> - Largest small system
+emulator</li>
+<li><a href="dlowe/index.html">2013/dlowe</a> - Best sparkling
 utility</li>
-<li><a href="2013/endoh1/index.html">2013/endoh1</a> - Most lazy
-SKIer</li>
-<li><a href="2013/endoh2/index.html">2013/endoh2</a> - Most
-recyclable</li>
-<li><a href="2013/endoh3/index.html">2013/endoh3</a> - Most tweetable
+<li><a href="endoh1/index.html">2013/endoh1</a> - Most lazy SKIer</li>
+<li><a href="endoh2/index.html">2013/endoh2</a> - Most recyclable</li>
+<li><a href="endoh3/index.html">2013/endoh3</a> - Most tweetable
 1-liner</li>
-<li><a href="2013/endoh4/index.html">2013/endoh4</a> - Most solid</li>
-<li><a href="2013/hou/index.html">2013/hou</a> - Best use of 1 Infinite
+<li><a href="endoh4/index.html">2013/endoh4</a> - Most solid</li>
+<li><a href="hou/index.html">2013/hou</a> - Best use of 1 Infinite
 Loop</li>
-<li><a href="2013/mills/index.html">2013/mills</a> - Most timely
+<li><a href="mills/index.html">2013/mills</a> - Most timely
 rendered</li>
-<li><a href="2013/misaka/index.html">2013/misaka</a> - Most catty</li>
-<li><a href="2013/morgan1/index.html">2013/morgan1</a> - Smallest large
+<li><a href="misaka/index.html">2013/misaka</a> - Most catty</li>
+<li><a href="morgan1/index.html">2013/morgan1</a> - Smallest large
 system simulator</li>
-<li><a href="2013/morgan2/index.html">2013/morgan2</a> - Most playfully
+<li><a href="morgan2/index.html">2013/morgan2</a> - Most playfully
 versatile</li>
-<li><a href="2013/robison/index.html">2013/robison</a> - Most poetic use
-of strings</li>
+<li><a href="robison/index.html">2013/robison</a> - Most poetic use of
+strings</li>
 </ul>
 <p> <strong>Jump to:</strong> <a href="#">top</a></p>