Remove standby parameter from README.md

[jirispilka]

Remove Standby settings from the Actor readme and replace it with mcp.apify.com configuration

[nicklamonov]

@jirispilka , could you share what was meant here, please? )

[jirispilka]

@nicklamonov If I recall correctly, this was about removing standby settings from the Actor readme and to replace it with mcp.apify.com