Fix links (#1)

* Fix links

* Update addrbook

* Update community

README.md

@@ -2,21 +2,19 @@
 
 ![banner](launch-banner.png)
 
-This repository contains the configuration parameters for Columbus, Terra's official mainnet. Columbus is the first decentralized network of nodes communicating over [Terra Core](https://github.com/terra-money/core).
+This repository contains the configuration parameters for Columbus, Terra's official mainnet. Columbus is the first decentralized network of nodes communicating over [Terra Core](https://github.com/classic-terra/core).
 
-To get a backgrounder on the network genesis, please refer [here](https://github.com/terra-money/mainnet/blob/master/GENESIS.md).
+To get a backgrounder on the network genesis, please refer [here](https://github.com/classic-terra/classic-mainnet/blob/master/GENESIS.md).
 
-**[Columbus-5](https://github.com/terra-money/mainnet/tree/master/columbus-5) is the latest iteration of mainnet**.
+**[Columbus-5](https://github.com/classic-terra/classic-mainnet/tree/master/columbus-5) is the latest iteration of mainnet**.
 
 ## Terra community
 
 Community channels actively being moderated are here:
 
-- [Website](https://terra.money/)
-- [Discord](https://discord.gg/bYfyhUT)
-- [Telegram](https://t.me/terra_announcements)
-- [Twitter](https://twitter.com/terra_money)
-- [YouTube](https://goo.gl/3G4T1z)
+- [Website](https://terrac.money)
+- [Discord](https://discord.gg/P97BN33U)
+- [Twitter](https://twitter.com/terrac_money)
 
 We will be making announcements regarding network upgrades using these channels, so please stay tuned.
 
@@ -70,7 +68,7 @@ [email protected]:26656
 You can also download nightly address book by
 
 ```bash
-curl https://network.terra.dev/addrbook.json > ~/.terra/config/addrbook.json
+curl https://raw.githubusercontent.com/classic-terra/classic-mainnet/master/columbus-5/addrbook.json > ~/.terra/config/addrbook.json
 ```
 
 ## Disclaimer