doc: document how to shutdown LiT

Fixes #171.

Author: guggero

doc/config-lnd-integrated.md

@@ -357,3 +357,12 @@ You can easily create an alias for this by adding the following line to your
 ```shell script
 alias lit-frcli="frcli --rpcserver=localhost:10009 --tlscertpath=~/.lnd/tls.cert --macaroonpath=~/.faraday/testnet/faraday.macaroon"
 ```
+
+## Shutting down LiT
+
+In the integrated mode LiT can be shut down by stopping the integrated `lnd`
+node:
+
+```shell
+⛰  lncli stop
+```

doc/config-lnd-remote.md

@@ -276,3 +276,15 @@ file:
 ```shell script
 alias lit-frcli="frcli --rpcserver=localhost:8443 --tlscertpath=~/.lit/tls.cert --macaroonpath=~/.faraday/testnet/faraday.macaroon"
 ```
+
+## Shutting down LiT
+
+In the remote mode, there is no explicit command for stopping LiT yet. But a
+clean shutdown can be achieved by either pressing `<Ctrl> + c` in the terminal
+where LiT is running. Or, if LiT is running in the background, the following
+command can be used to send an interrupt signal which will trigger the clean
+shutdown:
+
+```shell
+⛰  kill -s INT $(pidof litd)
+```