Update explorer list (#110)

* Update explorer list

* Update format

Author: boundless-forest

docs/build/getting-started/networks/crab.md

@@ -17,7 +17,6 @@ Crab is now a [parachain of Kusama](https://kusama.subscan.io/parachain/2105).
     - Decimal: **`18`**
 - Block Explorers:
     - [**CrabScan**](https://crab-scan.darwinia.network/)
-    - [**Crab SubView**](https://crab.subview.xyz/)
 - HTTPS RPC Endpoints:
     - **`https://crab-rpc.darwinia.network`**
     - **`https://crab-rpc.dcdao.box`**

docs/build/getting-started/networks/darwinia.md

@@ -18,8 +18,8 @@ Darwinia is now a [parachain of Polkadot](https://polkadot.subscan.io/parachain/
     - Symbol: [**RING**](https://coinmarketcap.com/currencies/darwinia-network/)
     - Decimal: 18
 - Block Explorers:
-    - [Subscan](https://darwinia.subscan.io/)
-    - [Subview](https://darwinia.subview.xyz/)
+    - [**Subscan**](https://darwinia.subscan.io/)
+    - [**DarwiniaScan**](https://explorer.darwinia.network/)
 - HTTPS RPC Endpoints:
     - **`https://rpc.darwinia.network`**
     - **`https://darwinia-rpc.dcdao.box`**