Add page explaining how to integrate new pi

Home.md

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-Welcome to the Wiki.
+Welcome to the wiki for my homelab! As this homelab is rather important to me,
+I'm trying to keep it very well organized an documented. While this wiki is
+mostly meant to be read by me in the future, there's definitely some
+interesting information in here for anyone with a similar setup.

_Sidebar.md

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-- [Integrating a new Pi](/integrate-new-pi)
+- [Integrating a new Pi](integrate-new-pi)

integrate-new-pi.md

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-# Hello
+# Integrating a new Pi
+
+When integrating a new Pi, a few steps need to be performed before it can be
+integrated with the rest of the Ansible config.
+
+First of all, an SD card should be formatted with [Debian Raspberry
+Pi](https://raspi.debian.net/) as the operating system. Before booting for the
+first time, change the following in `/boot/firmware/sysconf.txt` (you can do
+this by simply having the SD card mounted on your computer):
+
+* Set `hostname` to the desired name
+* Set `root_authorized_key` to the contents of the current computer's public
+  SSH key
+
+Now the SD card can be inserted into the Raspberry Pi. Connect the Pi to the
+LAN using a wired connection and let it boot. After a little while, it should
+show up on the local network with a DNS-assigned IP. You can discover what IP
+it received in many ways; I usually just check the router's configuration
+panel. Finally, decide what static IP the Pi should be assigned to from here on
+out.
+
+Now you can run the initial configuration of the Pi with the following command:
+
+```sh
+ansible-playbook -i [original ip], -e ansible_ssh_user=root -e static_ip=[static ip] first_run.yml
+```
+
+The [first_run.yml](src/branch/main/first_run.yml) playbook installs Python3
+and sets up the base user and SSH configuration so all other Ansible roles can
+work properly.