docs: split install guide per install method

docs/admin-manual/install/install-using-docker.md

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+---
+title: Install using docker
+sidebar_position: 10
+---
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+import CodeBlock from '@theme/CodeBlock';
+import vars from '@site/vars';
+
+This guide walk you though the steps required to install LibreTime on your system using docker.
+
+## Before installing
+
+Before installing LibreTime, you need to make sure that [Docker](https://docs.docker.com/engine/) is installed on your operating system and **up-to-date**.
+
+## Download
+
+First, set the version you want to install:
+
+<CodeBlock language="bash">
+echo LIBRETIME_VERSION="{vars.version}" > .env
+</CodeBlock>
+
+Download the docker-compose files from the repository:
+
+```bash
+# Load LIBRETIME_VERSION variable
+source .env
+
+wget "https://raw.githubusercontent.com/libretime/libretime/$LIBRETIME_VERSION/docker-compose.yml"
+wget "https://raw.githubusercontent.com/libretime/libretime/$LIBRETIME_VERSION/docker/nginx.conf"
+wget "https://raw.githubusercontent.com/libretime/libretime/$LIBRETIME_VERSION/docker/config.yml"
+```
+
+## Setup LibreTime
+
+Once the files are downloaded, generate a set of random passwords for the different docker services used by LibreTime:
+
+```bash
+echo "# Postgres
+POSTGRES_PASSWORD=$(openssl rand -hex 16)
+
+# RabbitMQ
+RABBITMQ_DEFAULT_PASS=$(openssl rand -hex 16)
+
+# Icecast
+ICECAST_SOURCE_PASSWORD=$(openssl rand -hex 16)
+ICECAST_ADMIN_PASSWORD=$(openssl rand -hex 16)
+ICECAST_RELAY_PASSWORD=$(openssl rand -hex 16)" >> .env
+cat .env
+```
+
+:::info
+
+You can find more details in the `docker-compose.yml` file or on the external services docker specific documentation:
+
+- [Postgres](https://hub.docker.com/_/postgres)
+- [RabbitMQ](https://hub.docker.com/_/rabbitmq)
+- [Icecast](https://github.com/libretime/icecast-docker#readme)
+
+:::
+
+Next, edit the [configuration file](../configuration.md) at `./config.yml` to set the previously generated passwords, fill required information, and to match your needs.
+
+:::info
+
+The `docker/config.yml` configuration file you previously downloaded already contains specific values required by the container setup, you shouldn't change them:
+
+```yaml
+database:
+  host: "postgres"
+rabbitmq:
+  host: "rabbitmq"
+playout:
+  liquidsoap_host: "liquidsoap"
+liquidsoap:
+  server_listen_address: "0.0.0.0"
+stream:
+  outputs:
+    .default_icecast_output:
+      host: "icecast"
+```
+
+:::
+
+Next, run the following commands to setup the database:
+
+```bash
+docker-compose run --rm api libretime-api migrate
+```
+
+Finally, start the services, and check that they're running properly using the following commands:
+
+```bash
+docker-compose up -d
+
+docker-compose ps
+docker-compose logs -f
+```
+
+## Securing LibreTime
+
+Once LibreTime is running, it's recommended to [install a reverse proxy](./reverse-proxy.md) to setup SSL termination and secure your installation.
+
+## First login
+
+Once the setup is completed, log in the interface (with the default user `admin` and password `admin`), and edit the project settings (go to **Settings** > **General**) to match your needs.