Enhance troubleshooting documentation for server re-provisioning

- Added a new section detailing the steps to re-provision servers from scratch, including removing the IP address from `.spin.yml` and cleaning up SSH known_hosts.
- Included code examples for clarity on the necessary commands to execute during the re-provisioning process.

Author: jaydrogers

docs/content/docs/7.server-access/2.troubleshooting-your-application.md

@@ -380,4 +380,94 @@ sudo docker config rm $(sudo docker config ls -q) # Remove all configurations
 ```
 ::
 
-Run the commands above individually to ensure everything is removed properly. Once you've verified everything is removed, you can deploy a fresh copy of your application.
+Run the commands above individually to ensure everything is removed properly. Once you've verified everything is removed, you can deploy a fresh copy of your application.
+
+## Re-provisioning servers from scratch
+Sometimes you may want to completely delete a server from your cloud provider and start fresh with a new one. This is common when:
+
+- You ran into issues during initial provisioning and want to start over
+- You're testing your infrastructure setup
+- You want to move to a different server type or location
+
+When you delete a server from your cloud provider (like Hetzner, DigitalOcean, or Vultr) and want to re-provision, you'll need to clean up a few things first.
+
+### Step 1: Remove the IP address from `.spin.yml`
+When Spin provisions a server through a provider, it automatically updates your `.spin.yml` file with the server's IP address. If you delete the server and want Spin to create a new one, you need to remove this `address` property.
+
+::code-panel
+---
+label: Before - Server with IP address assigned
+---
+```yaml
+servers:
+  - server_name: ubuntu-2gb-ash-1
+    environment: production
+    hardware_profile: hetzner_2c_2gb_ubuntu2404
+    address: 123.45.67.89  # Remove this line
+```
+::
+
+::code-panel
+---
+label: After - Server ready for re-provisioning
+---
+```yaml
+servers:
+  - server_name: ubuntu-2gb-ash-1
+    environment: production
+    hardware_profile: hetzner_2c_2gb_ubuntu2404
+```
+::
+
+### Step 2: Remove the server from SSH known_hosts
+Your local machine stores SSH host keys for servers you've connected to. When you create a new server, it will have a different host key, which causes SSH to show a warning about a potential security issue.
+
+To remove the old host key entry, run:
+
+::code-panel
+---
+label: Remove server from known_hosts
+---
+```bash
+ssh-keygen -R your.server.ip.address
+```
+::
+
+Replace `your.server.ip.address` with the IP address or hostname of the server you deleted. For example:
+
+::code-panel
+---
+label: Example removing a specific IP
+---
+```bash
+ssh-keygen -R 123.45.67.89
+```
+::
+
+::note
+If you used a hostname to connect to your server, you may need to remove both the hostname and IP address entries.
+::
+
+::code-panel
+---
+label: Example removing a hostname and IP address
+---
+```bash
+ssh-keygen -R myserver.example.com
+ssh-keygen -R 123.45.67.89 # Remove the IP address entry
+```
+::
+
+### Step 3: Re-provision your server
+Once you've cleaned up the `.spin.yml` file and SSH known_hosts, you can provision a fresh server:
+
+::code-panel
+---
+label: Provision a new server
+---
+```bash
+spin provision
+```
+::
+
+Spin will create a new server with your cloud provider and update your `.spin.yml` file with the new IP address.