docs: new installation docs!

docs/install/index.md

@@ -0,0 +1,22 @@
+---
+title: Installation
+description: Get started with Headplane.
+---
+
+# Installation
+
+Headplane is designed to be deployed within several different environments to
+ensure that it can seamlessly integrate into your existing infrastructure. First
+set up your configuration file and then pick the installation method that best
+suits your needs.
+
+## Configuration
+Headplane requires a configuration file to operate. A
+[sample file](https://github.com/tale/headplane/blob/main/config.example.yaml)
+is available to use as a starting point. Some of the important fields include:
+
+| Field               | Description                                            |
+|---------------------|--------------------------------------------------------|
+| **`headscale.url`** | Point to your Headscale server (e.g., `http://headscale.example.com` or `http://headscale:8080` in Docker). |
+| **`server.cookie_secret`** | Used to encrypt cookies. You can generate a random string using a command like `openssl rand -base64 32`. |
+| **`server.data_path`** | Just a path to keep in mind, especially if you're using Docker. |