complete bin/cvt-submission.sh

Successfully tested `bin/cvt-submission.sh` on a new entry in a new
year that was generated from a submission entry.number directory via
`sbin/post-collect.sh` from the submit tools.

Changed `bin/cvt-submission.sh` prompts to use "[Y,n]" and to default to yes.

The `bin/cvt-submission.sh` processes and appends YYYY/dir to `.allyear`.

Improved 215 error message and exit code from `bin/subst.entry-navbar.awk`.

Changed `bin/cvt-submission.sh` VERSION from "2.0.3 2025-05-18"
to "2.0.4 2025-05-18".

Changed `bin/output-index-author.sh` VERSION from "2.0.0 2025-03-13"
to "2.0.1 2025-05-18".

Changed `bin/output-index-inventory.sh` VERSION from "2.0.0 2025-03-13"
to "2.0.1 2025-05-18".

Changed `bin/output-index-inventory.sh` VERSION from "2.0.1 2025-05-17"
to "2.0.2 2025-05-18".

Changed `bin/subst.entry-index.sh` VERSION from "2.0.1 2025-05-17"
to "2.0.2 2025-05-18".

Changed `bin/subst.entry-navbar.awk` VERSION from "1.3.1 2025-05-17"
to "1.3.2 2025-05-18".

Update sitemap.

Tested the above via `make update` on macOS.

sitemap.xml

@@ -15226,7 +15226,7 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/bin/cvt-submission.sh</loc>
-    <lastmod>2025-05-18T06:47:21+00:00</lastmod>
+    <lastmod>2025-05-18T08:57:00+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/bin/entry2csv.sh</loc>
@@ -15334,11 +15334,11 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/bin/output-index-author.sh</loc>
-    <lastmod>2025-04-16T20:59:19+00:00</lastmod>
+    <lastmod>2025-05-18T08:48:13+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/bin/output-index-inventory.sh</loc>
-    <lastmod>2025-04-16T20:59:19+00:00</lastmod>
+    <lastmod>2025-05-18T08:48:44+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/bin/output-year-index.sh</loc>
@@ -15382,11 +15382,11 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/bin/subst.entry-index.sh</loc>
-    <lastmod>2025-05-18T06:53:55+00:00</lastmod>
+    <lastmod>2025-05-18T09:01:17+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/bin/subst.entry-navbar.awk</loc>
-    <lastmod>2025-05-18T05:47:19+00:00</lastmod>
+    <lastmod>2025-05-18T09:01:24+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/bin/subst.year-index.sh</loc>
@@ -15486,7 +15486,7 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/Makefile</loc>
-    <lastmod>2025-05-18T06:31:07+00:00</lastmod>
+    <lastmod>2025-05-18T08:54:49+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/markdown.html</loc>
@@ -15598,7 +15598,7 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/status.html</loc>
-    <lastmod>2025-05-18T06:51:52+00:00</lastmod>
+    <lastmod>2025-05-18T09:22:37+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/status.json</loc>