doc: integrate API and related tools

[Helias]

Add in the documentation how to integrate:

• PvPstats
• playermap
• the API
• Server Status
• Arena Stats

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[Helias]

Some notes for the future documentation:

<iframe src="https://yourwebsite.com/apps/pvpstats/"></iframe>

nginx conf

    location /apps {
      index index.html index.php;
    }

    location /api/ {
        proxy_set_header X-Forwarded-Host $host:$server_port;
        proxy_set_header X-Forwarded-Server $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://node-api:3000/;
    }

if nestJS can't connect for

Error: ER_NOT_SUPPORTED_AUTH_MODE: Client does not support authentication protocol requested by server; consider upgrading MySQL client

solution:

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password'