docs: Wrote a page to deploy the project via docker

docs/src/content/docs/getting-started/docker.mdx

@@ -0,0 +1,86 @@
+---
+title: Docker
+---
+
+Docker Compose is the recommended method to run Kekkai in production. 
+Below are the steps to deploy Kekkai with Docker Compose.
+
+Kekkai requires Docker Compose version 2.x.
+
+import { Steps } from '@astrojs/starlight/components';
+import { Code } from '@astrojs/starlight/components';
+
+
+<Steps>
+1. Preparing files
+    ```
+    git clone https://github.com/redume/Kekkai
+    ```
+    ```
+    cd Kekkai
+    ```
+
+2. Change config files
+
+    In nginx.conf, you need to specify your domain or ipv4 address
+    <Code code='
+    ...
+    listen 443 ssl;
+    server_name localhost; # Your domain
+    ...
+    ' lang='txt' title='ngixn.conf' />
+
+
+    To set up SSL. Create folder `CertSSL`
+    ```
+    mkdir CertSLL
+    ```
+
+    After that, copy the SSL certificates to the CertSSL folder, 
+    if the names are different, 
+    then change either the name of the certificates or in `nginx.conf`
+
+    <Code code='
+    ssl_certificate /etc/nginx/ssl/fullchain.pem;
+    ssl_certificate_key /etc/nginx/ssl/privkey.pem;
+    ' lang='txt' title='ngixn.conf' />
+
+    <Code code=
+    "
+    database: 
+    user: 'DATABASE_USERNAME'
+    password: 'DATABASE_PASSWORD'
+    host: 'DATABASE_HOST'
+    name: 'DATABASE_NAME'
+    port: 5432
+    ...
+    " lang='yaml' title='config.sample.yaml' />
+    Fill in the data in the database item, as well as in the .env config
+
+
+    <Code code='
+    # Connection secret for postgres. You should change it to a random password
+    # Please use only the characters `A-Za-z0-9`, without special characters or spaces
+
+    POSTGRES_PASSWORD=my_password
+
+    # If you do not know what you are doing, then you should not edit the values below
+    ###################################################################################
+    POSTGRES_DB=kekkai
+    DB_HOST=postgres
+    POSTGRES_USER=postgres
+    ' lang='txt' title='.env.sample' />
+
+    - Populate custom database information if necessary.
+    - Consider changing `DB_PASSWORD` to a custom value. 
+    Postgres is not publically 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`.
+
+3. Start the containers
+    ```shell
+    docker compose up -d
+    ```
+
+</Steps>