Replace tink-system namespace with tinkerbell

The tinkerbell.org install instructions now install the Helm chart
into the tinkerbell namespace. This commit aligns the namespaces
from the Install page and the playground to "tinkerbell".

Author: mmeier86

stack/docs/quickstarts/VAGRANTLVIRT.md

@@ -368,8 +368,8 @@ This option will also create a VM and provision an OS onto it.
 
    ```bash
    vagrant ssh stack
-   kubectl get jobs -n tink-system --watch
-   kubectl get pods -n tink-system --watch
+   kubectl get jobs -n tinkerbell --watch
+   kubectl get pods -n tinkerbell --watch
    exit
    # There is one Kubernetes job to download the Ubuntu image and an init
    # container in the hookos pod downloading the HookOS artifacts.
@@ -382,7 +382,7 @@ This option will also create a VM and provision an OS onto it.
 
    Ubuntu image download:
    ```bash
-   kubectl get jobs -n tink-system --watch
+   kubectl get jobs -n tinkerbell --watch
    NAME                    COMPLETIONS   DURATION   AGE
    download-ubuntu-jammy   0/1           49s        49s
    download-ubuntu-jammy   0/1           70s        70s
@@ -391,7 +391,7 @@ This option will also create a VM and provision an OS onto it.
    ```
    HookOS pod:
    ```bash
-   kubectl get pods -n tink-system --watch
+   kubectl get pods -n tinkerbell --watch
    NAME                          READY   STATUS      RESTARTS   AGE
    download-ubuntu-jammy-2w4wn   0/1     Completed   0          38m
    hookos-58b848576b-hzsv4       2/2     Running     0          38m
@@ -455,7 +455,7 @@ This option will also create a VM and provision an OS onto it.
 
    # watch for the workflow to complete
    # once the workflow is complete (see the expected output below for completion), move on to the next step
-   kubectl get -n tink-system workflow playground-workflow --watch
+   kubectl get -n tinkerbell workflow playground-workflow --watch
    ```
 
    <details>

stack/docs/quickstarts/VAGRANTVBOX.md

@@ -353,8 +353,8 @@ This option will also create a VM and provision an OS onto it.
 
    ```bash
    vagrant ssh stack
-   kubectl get jobs -n tink-system --watch
-   kubectl get pods -n tink-system --watch
+   kubectl get jobs -n tinkerbell --watch
+   kubectl get pods -n tinkerbell --watch
    exit
    # There is one Kubernetes job to download the Ubuntu image and an init
    # container in the hookos pod downloading the HookOS artifacts.
@@ -367,7 +367,7 @@ This option will also create a VM and provision an OS onto it.
 
    Ubuntu image download:
    ```bash
-   kubectl get jobs -n tink-system --watch
+   kubectl get jobs -n tinkerbell --watch
    NAME                    COMPLETIONS   DURATION   AGE
    download-ubuntu-jammy   0/1           49s        49s
    download-ubuntu-jammy   0/1           70s        70s
@@ -376,7 +376,7 @@ This option will also create a VM and provision an OS onto it.
    ```
    HookOS pod:
    ```bash
-   kubectl get pods -n tink-system --watch
+   kubectl get pods -n tinkerbell --watch
    NAME                          READY   STATUS      RESTARTS   AGE
    download-ubuntu-jammy-2w4wn   0/1     Completed   0          38m
    hookos-58b848576b-hzsv4       2/2     Running     0          38m
@@ -448,7 +448,7 @@ This option will also create a VM and provision an OS onto it.
 
    # watch for the workflow to complete
    # once the workflow is complete (see the example output below for completion), move on to the next step
-   kubectl get -n tink-system workflow playground-workflow --watch
+   kubectl get -n tinkerbell workflow playground-workflow --watch
    ```
 
    <details>

stack/vagrant/setup.sh

@@ -119,7 +119,7 @@ run_helm() {
 	local helm_chart_version=$6
 	local loadbalancer_interface=$7
 	local k3d_version=$8
-	local namespace="tink-system"
+	local namespace="tinkerbell"
 	local helm_version=$9
 	local loadbalancer_ip_2="${10}"