Add xrplmeta url to example env file (#1078)

## High Level Overview of Change

Add URL to template based on recent token search release

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.env.example

@@ -16,6 +16,9 @@ VITE_XAHAU_TESTNET_LINK=
 VITE_CUSTOMNETWORK_LINK=
 VITE_VALIDATOR=vl.ripple.com
 
+#External data source - XRPLMeta node for token search results
+XRPL_META_URL=s1.xrplmeta.org
+
 #XRPL Environment: mainnet, testnet, devnet, amm, hooks_testnet, custom
 VITE_ENVIRONMENT=mainnet