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`.

bin/README.md

@@ -37,13 +37,13 @@ Run a command on all IOCCC years.
 For example:
 
 ```sh
-all-years.sh -v 1 bin/gen-year-index.sh -v 1
+bin/all-years.sh -v 1 bin/gen-year-index.sh -v 1
 ```
 
 Or for example:
 
 ```sh
-all-years.sh -v 1 bin/chk-entry.sh
+bin/all-years.sh -v 1 bin/chk-entry.sh
 ```
 
 
@@ -91,6 +91,17 @@ bin/gen-location.sh -v 1
 ```
 
 
+### [gen-other-html.sh](gen-other-html.sh)
+
+Generate entry HTML files from markdown other than README.md to index.html HTML files.
+
+Usage:
+
+```sh
+bin/gen-other-html.sh -v 1
+```
+
+
 ### [gen-top-md2html.sh](gen-top-md2html.sh)
 
 Generate a number of top level HTML pages for the IOCCC web sites.