get rid of badger everywhere, including as an sdk/hints backend.

khatru/docs/index.md

@@ -24,7 +24,7 @@ features:
   - title: It plugs into event stores easily
     icon: 📦
     link: /core/eventstore
-    details: khatru's companion, the `eventstore` library, provides all methods for storing and querying events efficiently from LMDB, Badger and others.
+    details: khatru's companion, the `eventstore` library, provides all methods for storing and querying events efficiently from LMDB, BoltDB and others.
   - title: It supports NIP-42 AUTH
     icon: 🪪
     link: /core/auth
@@ -46,7 +46,7 @@ It allows you to create a fully-functional relay in 7 lines of code:
 ```go
 func main() {
 	relay := khatru.NewRelay()
-	db := badger.BadgerBackend{Path: "/tmp/khatru-badgern-tmp"}
+	db := boltdb.BoltBackend{Path: "/tmp/khatru-bolt-tmp"}
 	db.Init()
 	relay.UseEventStore(db, 400)
 	http.ListenAndServe(":3334", relay)