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`.

2012/index.html

@@ -219,32 +219,29 @@ Entries of 2012 - The 21st IOCCC</h1>
 <p><strong>Download IOCCC</strong> <a
 href="2012/ioccc.2012.tar.bz2">2012 entry source</a></p>
 <ul>
-<li><a href="2012/blakely/index.html">2012/blakely</a> - Most GIFted
+<li><a href="blakely/index.html">2012/blakely</a> - Most GIFted
 expressions</li>
-<li><a href="2012/deckmyn/index.html">2012/deckmyn</a> - Most notable
-and best tool</li>
-<li><a href="2012/dlowe/index.html">2012/dlowe</a> - Best way to lose a
+<li><a href="deckmyn/index.html">2012/deckmyn</a> - Most notable and
+best tool</li>
+<li><a href="dlowe/index.html">2012/dlowe</a> - Best way to lose a
 life</li>
-<li><a href="2012/endoh1/index.html">2012/endoh1</a> - Most complex
-ASCII fluid - Honorable mention</li>
-<li><a href="2012/endoh2/index.html">2012/endoh2</a> - PiE in the sky
+<li><a href="endoh1/index.html">2012/endoh1</a> - Most complex ASCII
+fluid - Honorable mention</li>
+<li><a href="endoh2/index.html">2012/endoh2</a> - PiE in the sky
 award</li>
-<li><a href="2012/grothe/index.html">2012/grothe</a> - Most
+<li><a href="grothe/index.html">2012/grothe</a> - Most
 conspiratorial</li>
-<li><a href="2012/hamano/index.html">2012/hamano</a> - Most elementary
-use of C - Silver award</li>
-<li><a href="2012/hou/index.html">2012/hou</a> - Most useful
-obfuscation</li>
-<li><a href="2012/kang/index.html">2012/kang</a> - Best short
-program</li>
-<li><a href="2012/konno/index.html">2012/konno</a> - Best one liner</li>
-<li><a href="2012/omoikane/index.html">2012/omoikane</a> - Most
+<li><a href="hamano/index.html">2012/hamano</a> - Most elementary use of
+C - Silver award</li>
+<li><a href="hou/index.html">2012/hou</a> - Most useful obfuscation</li>
+<li><a href="kang/index.html">2012/kang</a> - Best short program</li>
+<li><a href="konno/index.html">2012/konno</a> - Best one liner</li>
+<li><a href="omoikane/index.html">2012/omoikane</a> - Most
 surreptitious</li>
-<li><a href="2012/tromp/index.html">2012/tromp</a> - Most
-functional</li>
-<li><a href="2012/vik/index.html">2012/vik</a> - Best use of cocoa -
-Bronze award</li>
-<li><a href="2012/zeitak/index.html">2012/zeitak</a> - Balanced use of
+<li><a href="tromp/index.html">2012/tromp</a> - Most functional</li>
+<li><a href="vik/index.html">2012/vik</a> - Best use of cocoa - Bronze
+award</li>
+<li><a href="zeitak/index.html">2012/zeitak</a> - Balanced use of
 obfuscation - Gold award</li>
 </ul>
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