update IOCCC28 open and judging dates

The IOCCC28 will now open on **2025-03-05 23:19:17.131107 UTC**
and enter the judging state on **2025-06-05 04:03:02.010099 UTC**.

Updated sitemap, added news for 2025-02-12, and updated the status.

Performed `make www gen_status gen_sitemap timestamp` on macOS to complete the above.

sitemap.xml

@@ -2762,7 +2762,7 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/1993/dgibson/index.html</loc>
-    <lastmod>2025-01-10T06:52:47+00:00</lastmod>
+    <lastmod>2025-02-12T23:53:27+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/1993/dgibson/Makefile</loc>
@@ -15414,11 +15414,11 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/faq.html</loc>
-    <lastmod>2025-02-11T00:55:03+00:00</lastmod>
+    <lastmod>2025-02-11T02:33:39+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/faq.md</loc>
-    <lastmod>2025-02-11T00:55:03+00:00</lastmod>
+    <lastmod>2025-02-11T02:33:39+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/inc/index.html</loc>
@@ -15450,7 +15450,7 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/location.html</loc>
-    <lastmod>2025-01-16T23:38:07+00:00</lastmod>
+    <lastmod>2025-02-13T00:27:53+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/Makefile</loc>
@@ -15458,11 +15458,11 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/news.html</loc>
-    <lastmod>2025-01-30T22:17:38+00:00</lastmod>
+    <lastmod>2025-02-13T00:39:25+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/news.md</loc>
-    <lastmod>2025-01-30T22:17:38+00:00</lastmod>
+    <lastmod>2025-02-13T00:39:06+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/README.html</loc>
@@ -15478,7 +15478,7 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/status.json</loc>
-    <lastmod>2025-02-02T01:21:24+00:00</lastmod>
+    <lastmod>2025-02-13T00:39:30+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/thanks-for-help.html</loc>