Renamed `ioccc.ico` to `favicon.ico`.
Correctly added use of `favicon.ico` to all constructed HTML headers.
Fixed the smart quote in HTML elements problem.
Moved HTML "DO NOT EDIT" comments down below at the bottom of the
HTML phase 1 section. According to to the Nu Html Checker, a charset
attribute on a meta element found after the first 1024 bytes.
Changed `bin/md2html.sh` VERSION from "1.1.3 2024-03-28"
to "1.2 2024-03-30".
Improved `bin/gen-status.sh` to adjust the "status_update" value
only when the "contest_status" is changed.
Performed a `make www` to perform and test the above under macOS.
