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`.

2020/index.html

@@ -194,35 +194,30 @@ Entries of 2020 - The 27th IOCCC</h1>
 <p><strong>Download IOCCC</strong> <a
 href="2020/ioccc.2020.tar.bz2">2020 entry source</a></p>
 <ul>
-<li><a href="2020/burton/index.html">2020/burton</a> - Best
-one-liner</li>
-<li><a href="2020/carlini/index.html">2020/carlini</a> - Best of show -
-abuse of libc</li>
-<li><a href="2020/endoh1/index.html">2020/endoh1</a> - Most
-explosive</li>
-<li><a href="2020/endoh2/index.html">2020/endoh2</a> - Best
-perspective</li>
-<li><a href="2020/endoh3/index.html">2020/endoh3</a> - Most
-head-turning</li>
-<li><a href="2020/ferguson1/index.html">2020/ferguson1</a> - Don’t tread
-on me award</li>
-<li><a href="2020/ferguson2/index.html">2020/ferguson2</a> - Most
+<li><a href="burton/index.html">2020/burton</a> - Best one-liner</li>
+<li><a href="carlini/index.html">2020/carlini</a> - Best of show - abuse
+of libc</li>
+<li><a href="endoh1/index.html">2020/endoh1</a> - Most explosive</li>
+<li><a href="endoh2/index.html">2020/endoh2</a> - Best perspective</li>
+<li><a href="endoh3/index.html">2020/endoh3</a> - Most head-turning</li>
+<li><a href="ferguson1/index.html">2020/ferguson1</a> - Don’t tread on
+me award</li>
+<li><a href="ferguson2/index.html">2020/ferguson2</a> - Most
 enigmatic</li>
-<li><a href="2020/giles/index.html">2020/giles</a> - Most phony</li>
-<li><a href="2020/kurdyukov1/index.html">2020/kurdyukov1</a> - Best
+<li><a href="giles/index.html">2020/giles</a> - Most phony</li>
+<li><a href="kurdyukov1/index.html">2020/kurdyukov1</a> - Best
 utility</li>
-<li><a href="2020/kurdyukov2/index.html">2020/kurdyukov2</a> - Least
+<li><a href="kurdyukov2/index.html">2020/kurdyukov2</a> - Least
 detailed</li>
-<li><a href="2020/kurdyukov3/index.html">2020/kurdyukov3</a> - Bset
-slaml prragom</li>
-<li><a href="2020/kurdyukov4/index.html">2020/kurdyukov4</a> - Best
-abuse of lámatyávë</li>
-<li><a href="2020/otterness/index.html">2020/otterness</a> - Most
+<li><a href="kurdyukov3/index.html">2020/kurdyukov3</a> - Bset slaml
+prragom</li>
+<li><a href="kurdyukov4/index.html">2020/kurdyukov4</a> - Best abuse of
+lámatyávë</li>
+<li><a href="otterness/index.html">2020/otterness</a> - Most
 percussive</li>
-<li><a href="2020/tsoj/index.html">2020/tsoj</a> - Most misleading
+<li><a href="tsoj/index.html">2020/tsoj</a> - Most misleading
 indentation</li>
-<li><a href="2020/yang/index.html">2020/yang</a> - Best abuse of
-CPP</li>
+<li><a href="yang/index.html">2020/yang</a> - Best abuse of CPP</li>
 </ul>
 <p> <strong>Jump to:</strong> <a href="#">top</a></p>