remove all NIP pointers from the repo (it can be confusing that there are just 12 NIPs but there are many more) and provide some extra info in nips/README.md what NIPs are (and why this directory is here in the repo) and where to find the NIPs

nips/01.md

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nips/02.md

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nips/03.md

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nips/06.md

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nips/12.md

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nips/README.md

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+> 💡 The original page was moved to https://github.com/nostr-protocol/nips/blob/master/README.md
+
+# NIPs
+
+NIPs stand for **Nostr Implementation Possibilities**.
+They exist to document what may be implemented by Nostr-compatible relay and client software.
+
+List of NIPs: https://github.com/nostr-protocol/nips?tab=readme-ov-file#list