processed more of John Dalbec's fix of 2000/dlowe

Added processing of "%%REPO_TOP_URL%%" tokens to `bin/subst.default.sh`.

Updated `find-missing-links.sh` to not falsely report missing links
when a "%%REPO_TOP_URL%%" token is used.

Changed `bin/subst.default.sh` VERSION from "1.3.2 2024-08-05"
to "1.4.0 2025-04-16".

Changed `bin/find-missing-links.sh` VERSION from "1.1.1 2024-04-28"
to "1.2.0 2025-04-16".

Due to a `pandoc(1)` bug fix, `2011/fredriksson/index.html` and
`2012/kang/index.html` were modified.  The bug fix removed extraneous
whitespace that was previously introduced into HTML under certain
situations.  These 2 changes do **NOT** impact the way web browsers
render these pages, however.

Updated sitemap.

Updated tarballs based on entry mods since 2025 March 4
(commit 233e5e90a5 just prior
to the IOCCC28 open).

Tested the above via `make update` on macOS.

status.html

@@ -25,14 +25,14 @@
 <!-- END: this line ends content from: inc/head.default.html -->
 
 <!-- -->
-<!-- This web page was formed via the tool: bin/gen-top-html.sh -->
-<!-- The content of main section of this web page came from: status.md -->
+<!-- This web page was formed via the tool: bin/gen-status.sh -->
+<!-- The main section of this web page came from JSON and other data files -->
 <!-- -->
 
 <!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
-<!-- !!! Do not modify this web page, instead modify the file: status.md !!! -->
-<!-- !!! Do not modify this web page, instead modify the file: status.md !!! -->
-<!-- !!! Do not modify this web page, instead modify the file: status.md !!! -->
+<!-- The main section of this web page was generated via the tool: bin/gen-status.sh -->
+<!-- The main section of this web page was generated via the tool: bin/gen-status.sh -->
+<!-- The main section of this web page was generated via the tool: bin/gen-status.sh -->
 <!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
 
 <!-- Markdown content was converted into HTML via the tool: bin/md2html.sh -->
@@ -435,7 +435,7 @@
         &quot;no_comment&quot; : &quot;mandatory comment: because comments were removed from the original JSON spec&quot;,
         &quot;IOCCC_status_version&quot; : &quot;1.0 2024-03-09&quot;,
         &quot;contest_status&quot; : &quot;pending&quot;,
-        &quot;news_update&quot; : &quot;2025-04-16T16:35:11+00:00&quot;,
+        &quot;news_update&quot; : &quot;2025-04-16T20:29:15+00:00&quot;,
         &quot;status_update&quot; : &quot;2024-12-29T10:01:35+00:00&quot;
     }</code></pre>