removed .id files from winning dirs

The `.id` files are no longer needed and so they were removed.

The `winner_id` (the contents of the `.id` files) are simply
a concatenation of "year" and "_" and "dir".

Adjusted `.inventory.html`, `tmp/README.md`,
`tmp/fake.gen_inventory.sh`, and the manifest according
to the above.

2013/cable3/.id

@@ -1 +0,0 @@
-2013_cable3

2013/cable3/.inventory.html

@@ -6,7 +6,7 @@
 <!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
 <!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
 <!-- -->
-<!-- file: 2013/cable3/.inventory.html created by: fake.gen_inventory.sh version: 1.0.0 2023-10-31 -->
+<!-- file: 2013/cable3/.inventory.html created by: fake.gen_inventory.sh version: 1.0.1 2023-10-31 -->
 <html lang="en">
 <head>
 <meta charset="UTF-8">
@@ -29,7 +29,6 @@
 <li>XXX - put links to other winners_rank numbered inventory files - XXX</a></li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/2013/cable3/.inventory.html">.inventory.html</a> - full inventory of all winner files</a></li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/2013/cable3/.gitignore">.gitignore</a> - list of files that should not be committed under git</a></li>
-<li><a href="https://github.com/ioccc-src/temp-test-ioccc/2013/cable3/.id">.id</a> - winner id string - this file will be removed when .winner.json exists</a></li>
 <li>XXX - put links to other null winners_rank inventory files - XXX</a></li>
 </ul>