doc: Fix dead links

README.md

@@ -401,7 +401,7 @@ a heartwarming welcome message.
    ```
 
 1. We also need a STUN/TURN client to actually initiate a connection. STUNner comes with a handy
-   STUN/TURN client called [`turncat`](cmd/turncat/README.md) for this purpose. Once
+   STUN/TURN client called [`turncat`](docs/cmd/turncat.md) for this purpose. Once
    [installed](cmd/turncat/README.md#installation), you can fire up `turncat` to listen on the
    standard input and send everything it receives to STUNner. Type any input and press Enter, and
    you should see a nice greeting from your cluster!

docs/examples/simple-tunnel/README.md

@@ -18,7 +18,7 @@ The tutorial assumes a fresh STUNner installation; see the [STUNner installation
 
 ### Setup
 
-In this tutorial we perform a quick Kubernetes/STUNner benchmark: we fire up an iperf server inside the cluster and perform a speed test from the local console. We will use the [`turncat`](../../cmd/turncat) client utility to tunnel test traffic to the iperf server via STUNner acting as a STUN/TURN gateway.
+In this tutorial we perform a quick Kubernetes/STUNner benchmark: we fire up an iperf server inside the cluster and perform a speed test from the local console. We will use the [`turncat`](../../cmd/turncat.md) client utility to tunnel test traffic to the iperf server via STUNner acting as a STUN/TURN gateway.
 
 ![STUNner benchmarks setup](../../img/stunner_benchmark.svg)