Delete readmes, update docs

packages/util/README.md

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-# @welshman/util [![version](https://badgen.net/npm/v/@welshman/util)](https://npmjs.com/package/@welshman/util)
-
-Some nostr-specific utilities. For the most part, these will not have side effects or manage state. Includes:
-
-- Event kind constants
-- A nostr address class
-- Utilities for working with nostr filters and tags
-- Helpers for working with zap events and lightning invoices
-- A `Encryptable` for ensuring payloads get encrypted
-- An implementation of an in-memory relay, backed by an events repository
-- Utilities for building events, validating signatures, and checking event type (replaceable, etc.)
-- Types and utilities for NIP 89 handlers
-- Types and utilities for NIP 51 lists
-- Types and utilities for NIP 01 profile metadata
-- Types and utilities for NIP 11 relay profiles