docs: face lift, botox x3 (#18184)

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* docs: face lift, botox x3

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docs/docs/partials/_docker-compose-install-steps.mdx

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+import CodeBlock from '@theme/CodeBlock';
+import ExampleEnv from '!!raw-loader!../../../docker/example.env';
+
+### Step 1 - Download the required files
+
+Create a directory of your choice (e.g. `./immich-app`) to hold the `docker-compose.yml` and `.env` files.
+
+```bash title="Move to the directory you created"
+mkdir ./immich-app
+cd ./immich-app
+```
+
+Download [`docker-compose.yml`](https://github.com/immich-app/immich/releases/latest/download/docker-compose.yml) and [`example.env`](https://github.com/immich-app/immich/releases/latest/download/example.env) by running the following commands:
+
+```bash title="Get docker-compose.yml file"
+wget -O docker-compose.yml https://github.com/immich-app/immich/releases/latest/download/docker-compose.yml
+```
+
+```bash title="Get .env file"
+wget -O .env https://github.com/immich-app/immich/releases/latest/download/example.env
+```
+
+You can alternatively download these two files from your browser and move them to the directory that you created, in which case ensure that you rename `example.env` to `.env`.
+
+### Step 2 - Populate the .env file with custom values
+
+<CodeBlock language="bash" title="Default environmental variable content">
+  {ExampleEnv}
+</CodeBlock>
+
+- Populate `UPLOAD_LOCATION` with your preferred location for storing backup assets. It should be a new directory on the server with enough free space.
+- Consider changing `DB_PASSWORD` to a custom value. Postgres is not publicly exposed, so this password is only used for local authentication.
+  To avoid issues with Docker parsing this value, it is best to use only the characters `A-Za-z0-9`. `pwgen` is a handy utility for this.
+- Set your timezone by uncommenting the `TZ=` line.
+- Populate custom database information if necessary.
+
+### Step 3 - Start the containers
+
+From the directory you created in Step 1 (which should now contain your customized `docker-compose.yml` and `.env` files), run the following command to start Immich as a background service:
+
+```bash title="Start the containers"
+docker compose up -d
+```