fix core chain rpc url to archive node (#952)

* fix core chain rpc url

* update core logo

* fix logo

Author: leeyanbtcs

src/networks.json

@@ -735,13 +735,13 @@
     "network": "mainnet",
     "multicall": "0x024f0041b76B598c2A0a75004F8447FaF67BD004",
     "rpc": [
-      "https://rpc.coredao.org/"
+      "https://rpcar.coredao.org/"
     ],
     "explorer": {
       "url": "https://scan.coredao.org"
     },
     "start": 853908,
-    "logo": "ipfs://QmVctLQ44vhkwejja9DDjDYUdYgVRBEWs242mhd95SeM5q"
+    "logo": "ipfs://bafkreigjv5yb7uhlrryzib7j2f73nnwqan2tmfnwjdu26vkk365fyesoiu"
   },
   "1284": {
     "key": "1284",