Update nostr gem, switch to Ruby for bech32 encoding

app/javascript/controllers/settings/nostr_pubkey_controller.js

@@ -1,5 +1,4 @@
 import { Controller } from "@hotwired/stimulus"
-import { bech32 } from "bech32"
 
 function hexToBytes (hex) {
   let bytes = []
@@ -15,10 +14,6 @@ export default class extends Controller {
   static values  = { userAddress: String, pubkeyHex: String, sharedSecret: String }
 
   connect () {
-    if (this.hasPubkeyHexValue && this.pubkeyHexValue.length > 0) {
-      this.pubkeyBech32InputTarget.value = this.pubkeyBech32
-    }
-
     if (window.nostr) {
       if (this.hasSetPubkeyTarget) {
         this.setPubkeyTarget.disabled = false
@@ -53,11 +48,6 @@ export default class extends Controller {
     }
   }
 
-  get pubkeyBech32 () {
-    const words = bech32.toWords(hexToBytes(this.pubkeyHexValue))
-    return bech32.encode('npub', words)
-  }
-
   get csrfToken () {
     const element = document.head.querySelector('meta[name="csrf-token"]')
     return element.getAttribute("content")