Documentation for Nestri (#116)

I have made documentation for Nestri, so everybody easy can find
instructions to get started. It will also make it easier for people to
help contribute to the documentation.

The documentation is built with Nuxt3, [Docus
](https://github.com/nuxt-themes) which uses Nuxt Content.

![image](https://github.com/user-attachments/assets/b30258c3-2267-4710-b8f4-48145e7c98d0)

![image](https://github.com/user-attachments/assets/6ccad52e-b6e1-4c8d-9c0c-bc4fae0227f1)

apps/docs/content/3.nestri-relay/2.selfhosted-nestri-relay.md

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+## Self-hosted Nestri Relay
+
+For those who prefer full control over their infrastructure, it is possible to self-host the Nestri Relay. However, setting this up can be a bit complex, as it requires generating SSL certificates for secure communication between your Nestri Node and your gaming devices. There are three main options:
+
+- **Let's Encrypt Certificate**: This is the **recommended option** for self-hosting and requires a domain name. You can generate a certificate using tools like **certbot** or **acme.sh**. Let's Encrypt provides free SSL certificates that are trusted by most browsers and are relatively straightforward to set up.
+
+- **Purchased SSL Certificate**: The **easiest option** for most users is to buy an SSL certificate from a trusted Certificate Authority (CA). This option eliminates much of the hassle involved with certificate generation, as these certificates are already trusted by browsers and don’t require as much manual setup.
+
+While self-hosting offers more flexibility, most users will find the **Nestri-hosted Relay** to be the easiest and most reliable option for getting started with cloud gaming on Nestri. This hosted relay is available to everyone and requires no configuration.
+
+---
+
+## Prerequisites
+
+1. **Server Requirements:**
+   - Ensure **port 443** is open for both **TCP and UDP** (`:443/udp & :443/tcp`).
+   - The server should have at least **4GB RAM** and **2 vCPUs**.
+   - Supports both ARM or AMD64 architecture.
+
+2. **Software Requirements:**
+   - Docker and `docker-compose` must be installed on the server. You can use [this installation script](https://github.com/docker/docker-install) to set up Docker.
+   - Git must be installed to clone the necessary repository.
+
+3. **Certificates:**
+   - You will need both private and public SSL certificates. It is recommended to use certificates from a **trusted Certificate Authority** (CA), either by using **Let's Encrypt** or purchasing a commercial SSL certificate, for secure communication. Avoid using self-signed certificates, as they can lead to compatibility issues and security warnings in browsers.