Remove README files now migrated to SGML docs.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 1308d6dd80625207255e38028a513fa7defd569b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-12-02T21:15:38Z
Releases: 8.3.0
Remove README files now migrated to SGML docs.

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