enh(1441): Add config's storage into BMA /node/summary

Add storage infos into /node/summary - close #1441.

New /node/sumary response should be :

{
  "duniter": {
    "software": "duniter",
    "version": "1.8.7",
    "forkWindowSize": 100,
    "storage": {
      "transaction": true,
      "wotwizard": false
    }
  }
}

app/lib/dto/ConfDTO.ts

@@ -24,7 +24,6 @@ export interface Keypair {
 
 export interface StorageDTO {
   storage?: {
-    transactions?: boolean;
     wotwizard?: boolean;
   };
 }
@@ -200,7 +199,6 @@ export class ConfDTO
     },
     public powNoSecurity = false,
     public storage = {
-      transactions: false,
       wotwizard: false,
     },
     public txsMempoolSize?: number