eventstore: replace bluge with bleve.

bluge seems to be abandoned and bleve should work better, who knows.

eventstore/bleve/delete.go

@@ -0,0 +1,9 @@
+package bleve
+
+import (
+	"fiatjaf.com/nostr"
+)
+
+func (b *BleveBackend) DeleteEvent(id nostr.ID) error {
+	return b.index.Delete(id.Hex())
+}