add news for 2025-07-30 and update top level Makefile

Added news for **2025-07-30** with the  scheduled the date for the IOCCC
Awards Presentation and Source Code Reveal for IOCCC28 to be on 2025
August 02 11:00 (11AM) Pacific.

We add `make news` to the top level `Makefile.

Ran `make news timestamp` to perform the above.

sitemap.xml

@@ -15502,7 +15502,7 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/Makefile</loc>
-    <lastmod>2025-07-26T06:09:44+00:00</lastmod>
+    <lastmod>2025-07-31T04:29:02+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/markdown.html</loc>
@@ -15514,11 +15514,11 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/news.html</loc>
-    <lastmod>2025-07-26T18:35:08+00:00</lastmod>
+    <lastmod>2025-07-31T04:20:48+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/news.md</loc>
-    <lastmod>2025-07-26T09:01:09+00:00</lastmod>
+    <lastmod>2025-07-31T04:20:41+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/next/guidelines.html</loc>
@@ -15634,11 +15634,11 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/status.html</loc>
-    <lastmod>2025-07-26T18:47:27+00:00</lastmod>
+    <lastmod>2025-07-31T04:33:30+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/status.json</loc>
-    <lastmod>2025-07-26T09:25:06+00:00</lastmod>
+    <lastmod>2025-07-31T04:20:48+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/status.md</loc>