Rewrite the card with the new opening

#2

The card opens with the three-character codes that give the collection its name and with the dependence of a code's meaning on the system that defines it. It then covers the data, uses, verifiable results, construction and the full inventory of systems.

Corrections, checked against the published Parquet files: parent_code is present in 13 systems, not 3; extra has 124 distinct keys, not about 200; in com/tlg, 6,766 of the 7,359 code words carry their phrase. The N2T prefix count and the Hub search count were removed because they could not be reproduced.

Only README.md changes; no Parquet file is modified.

brennercruvinel changed pull request status to merged

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