Move the documentation repository to a public repo

Added a LICENSE and documentation on how to contribute

Updated CI/CD to use the root level code

docs/overview/setup-keys.md

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+---
+sidebar_position: 3
+---
+
+# Setup Keys
+
+Setup key is a pre-authentication key that allows to register new machines in your network. 
+It simply associates a machine with an account on a first run.
+
+The setup key can be provided as a parameter to the ```netbird up``` command. 
+This makes it possible to run automated deployments with infrastructure-as-code software like Ansible, Cloudformation or Terraform.
+
+```bash
+sudo netbird up --setup-key <SETUP KEY>
+```
+
+### Types of Setup Keys
+
+There are 2 types of setup keys:
+* **One-off key**. This type of key can be used only once to authenticate a machine.
+* **Reusable key**. This type of key can be used multiple times to authenticate machines.
+
+### Using Setup Keys
+
+Setup keys are available in the NetBird Management dashboard under the Setup Keys tab [https://app.netbird.io/setup-keys](https://app.netbird.io/setup-keys).
+
+By default, we generate 2 setup keys right after account creation. You can easily add new or revoke keys.
+
+![](/img/architecture/setup-keys.png)
+
+:::tip revoking a key
+When revoking a key, all machines authenticated with this key will remain connected in the network. The same logic applies when the key expires.
+:::
+### Expiration
+
+Setup keys are set to expire after 30 days. When expired, the setup key can't be used anymore.