Add dev_commit.sh helper and no-emoji mandate

wp-includes/blocks/calendar/style-rtl.min.css

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+.wp-block-calendar{text-align:center}.wp-block-calendar td,.wp-block-calendar th{border:1px solid;padding:.25em}.wp-block-calendar th{font-weight:400}.wp-block-calendar caption{background-color:inherit}.wp-block-calendar table{border-collapse:collapse;width:100%}.wp-block-calendar table:where(:not(.has-text-color)){color:#40464d}.wp-block-calendar table:where(:not(.has-text-color)) td,.wp-block-calendar table:where(:not(.has-text-color)) th{border-color:#ddd}.wp-block-calendar table.has-background th{background-color:inherit}.wp-block-calendar table.has-text-color th{color:inherit}:where(.wp-block-calendar table:not(.has-background) th){background:#ddd}