require display_as to be a lower case word in .entry.json

The `display_as` field in an `.entry_json` file must match
the regex `^[a-z][0-9a-z]*$` now.  This is needed to reduce
errors during the final round while converting a potential
submission to entry form.

Modify `1992/buzzard.2/.entry.json` and
`1993/rince/.entry.json` to change `display_as` field
to use lower case.

Correct `2012/omoikane/.entry.json` to correctly
reflect changes made by commit 2955e5d07e
and commit 2955e5d07e.

Change `bin/cvt-submission.sh` to verify that the `display_as`
matches the above regex.

Changed `bin/cvt-submission.sh` VERSION from "2.2.2 2025-06-30"
to "2.3.0 2025-07-02".

Rebuild all tarballs, both at the entry and the year level
due recent changes to `var.mk`, `1337.mk`, and `ioccc.css`.

Rebuild sitemap due to the changes above.

Ran `make update` to test and perform the above.

1992/buzzard.2/.entry.json

@@ -59,7 +59,7 @@
             "OK_to_edit" : true,
             "display_as" : "html",
             "display_via_github" : false,
-            "entry_text" : "about the FORTH language"
+            "entry_text" : "about the forth language"
         },
         {
             "file_path" : "try.alt.sh",
@@ -81,71 +81,71 @@
             "file_path" : "demo1.1st",
             "inventory_order" : 150,
             "OK_to_edit" : true,
-            "display_as" : "FORTH",
+            "display_as" : "forth",
             "display_via_github" : true,
-            "entry_text" : "demo FORTH source"
+            "entry_text" : "demo forth source"
         },
         {
             "file_path" : "demo1.th",
             "inventory_order" : 150,
             "OK_to_edit" : true,
-            "display_as" : "FORTH",
+            "display_as" : "forth",
             "display_via_github" : true,
-            "entry_text" : "demo FORTH source"
+            "entry_text" : "demo forth source"
         },
         {
             "file_path" : "demo2.th",
             "inventory_order" : 150,
             "OK_to_edit" : true,
-            "display_as" : "FORTH",
+            "display_as" : "forth",
             "display_via_github" : true,
-            "entry_text" : "demo FORTH source"
+            "entry_text" : "demo forth source"
         },
         {
             "file_path" : "demo3.th",
             "inventory_order" : 150,
             "OK_to_edit" : true,
-            "display_as" : "FORTH",
+            "display_as" : "forth",
             "display_via_github" : true,
-            "entry_text" : "demo FORTH source"
+            "entry_text" : "demo forth source"
         },
         {
             "file_path" : "demo4.th",
             "inventory_order" : 150,
             "OK_to_edit" : true,
-            "display_as" : "FORTH",
+            "display_as" : "forth",
             "display_via_github" : true,
-            "entry_text" : "demo FORTH source"
+            "entry_text" : "demo forth source"
         },
         {
             "file_path" : "demo5.th",
             "inventory_order" : 150,
             "OK_to_edit" : true,
-            "display_as" : "FORTH",
+            "display_as" : "forth",
             "display_via_github" : true,
-            "entry_text" : "demo FORTH source"
+            "entry_text" : "demo forth source"
         },
         {
             "file_path" : "demo6.th",
             "inventory_order" : 150,
             "OK_to_edit" : true,
-            "display_as" : "FORTH",
+            "display_as" : "forth",
             "display_via_github" : true,
-            "entry_text" : "demo FORTH source"
+            "entry_text" : "demo forth source"
         },
         {
             "file_path" : "help.th",
             "inventory_order" : 150,
             "OK_to_edit" : true,
-            "display_as" : "FORTH",
+            "display_as" : "forth",
             "display_via_github" : true,
-            "entry_text" : "demo FORTH source"
+            "entry_text" : "demo forth source"
         },
         {
             "file_path" : "third",
             "inventory_order" : 150,
             "OK_to_edit" : true,
-            "display_as" : "FORTH",
+            "display_as" : "forth",
             "display_via_github" : true,
             "entry_text" : "the third source"
         },

1993/rince/.entry.json

@@ -65,33 +65,33 @@
             "file_path" : "rince.data1",
             "inventory_order" : 100,
             "OK_to_edit" : true,
-            "display_as" : "CABBAGE",
+            "display_as" : "cabbage",
             "display_via_github" : true,
-            "entry_text" : "CABBAGE data file"
+            "entry_text" : "cabbage data file"
         },
         {
             "file_path" : "rince.data2",
             "inventory_order" : 100,
             "OK_to_edit" : true,
-            "display_as" : "CABBAGE",
+            "display_as" : "cabbage",
             "display_via_github" : true,
-            "entry_text" : "CABBAGE data file"
+            "entry_text" : "cabbage data file"
         },
         {
             "file_path" : "rince.data3",
             "inventory_order" : 100,
             "OK_to_edit" : true,
-            "display_as" : "CABBAGE",
+            "display_as" : "cabbage",
             "display_via_github" : true,
-            "entry_text" : "CABBAGE data file"
+            "entry_text" : "cabbage data file"
         },
         {
             "file_path" : "rince.data4",
             "inventory_order" : 100,
             "OK_to_edit" : true,
-            "display_as" : "CABBAGE",
+            "display_as" : "cabbage",
             "display_via_github" : true,
-            "entry_text" : "CABBAGE data file"
+            "entry_text" : "cabbage data file"
         },
         {
             "file_path" : "1993_rince.tar.bz2",