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

mirror/ioccc

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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.

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