Problem: All Tendermint docs moved (#2483)

Solution: Update all links to Tendermint docs

CHANGELOG.md

@@ -189,7 +189,7 @@ Re-enabled multi-threading. [Pull request #2258](https://github.com/bigchaindb/b
 
 ### Known Issues
 
-Tendermint changed how it responds to a request to store data (via the [Tendermint Broadcast API](http://tendermint.readthedocs.io/projects/tools/en/master/using-tendermint.html#broadcast-api)) between version 0.12 and 0.19.2. We started modifying the code of BigchainDB Server to account for those changes in responses (in [pull request #2239](https://github.com/bigchaindb/bigchaindb/pull/2239)), but we found that there's a difference between what the Tendermint documentation _says_ about those responses and how Tendermint actually responds. We need to determine Tendermint's intent before we can finalize that pull request.
+Tendermint changed how it responds to a request to store data (via the [Tendermint Broadcast API](https://tendermint.com/docs/tendermint-core/using-tendermint.html#broadcast-api)) between version 0.12 and 0.19.2. We started modifying the code of BigchainDB Server to account for those changes in responses (in [pull request #2239](https://github.com/bigchaindb/bigchaindb/pull/2239)), but we found that there's a difference between what the Tendermint documentation _says_ about those responses and how Tendermint actually responds. We need to determine Tendermint's intent before we can finalize that pull request.
 
 ### Notes
 

docs/contributing/source/dev-setup-coding-and-contribution-process/run-node-as-processes.md

@@ -69,7 +69,7 @@ The commands are:
 export PATH=${PATH}:${GOPATH}/bin
 ```
 
-Follow [the Tendermint docs](https://tendermint.readthedocs.io/en/master/install.html#from-source) to install Tendermint from source.
+Follow [the Tendermint docs](https://tendermint.com/docs/introduction/install.html#from-source) to install Tendermint from source.
 
 If the installation is successful then Tendermint is installed at `$GOPATH/bin`. To ensure Tendermint's installed fine execute the following command,
 

docs/root/source/decentralized.md

@@ -20,6 +20,6 @@ A consortium can increase its decentralization (and its resilience) by increasin
 
 There’s no node that has a long-term special position in the BigchainDB network. All nodes run the same software and perform the same duties.
 
-If someone has (or gets) admin access to a node, they can mess with that node (e.g. change or delete data stored on that node), but those changes should remain isolated to that node. The BigchainDB network can only be compromised if more than one third of the nodes get compromised. See the [Tendermint documentation](https://tendermint.readthedocs.io/projects/tools/en/master/introduction.html) for more details.
+If someone has (or gets) admin access to a node, they can mess with that node (e.g. change or delete data stored on that node), but those changes should remain isolated to that node. The BigchainDB network can only be compromised if more than one third of the nodes get compromised. See the [Tendermint documentation](https://tendermint.com/docs/introduction/introduction.html) for more details.
 
 It’s worth noting that not even the admin or superuser of a node can transfer assets. The only way to create a valid transfer transaction is to fulfill the current crypto-conditions on the asset, and the admin/superuser can’t do that because the admin user doesn’t have the necessary information (e.g. private keys).

proposals/extend-post-txn.md

@@ -12,7 +12,7 @@ Add new query parameter `mode` to the [post transaction api](https://docs.bigcha
 
 ## Problem Description
 When posting a transaction it is broadcast asynchronously to Tendermint which enables the client to return immediately. Furthermore, the transaction status API would allow the client to get the current status for a given transaction. The above workflow seems efficient when the client doesn't need to wait until a transaction gets committed. In case a client wishes to wait until a transaction gets committed it would need to poll the transaction status api. 
-The Tendermint api allows to post a transaction in [three modes](http://tendermint.readthedocs.io/projects/tools/en/master/using-tendermint.html#broadcast-api),
+The Tendermint api allows to post a transaction in [three modes](https://tendermint.com/docs/tendermint-core/using-tendermint.html#broadcast-api),
 
 - `/broadcast_tx_async` post transaction and return
 - `/broadcast_tx_sync` post transaction and return after `checkTx` is executed