docs(web-readme): add docker local deployment guide

[DM1-1]

PR Checklist

If you have any questions, you can refer to the Contributing Guide

What is the current behavior?

Issue Number

#1575

What is the new behavior?

Add docker local deployment guide.

Does this PR introduce a breaking change?

• Yes
• No

Specific Instructions

Support for PR#1619

Other information

[ysfscream]

@DM1-1 It seems that I haven't seen updates on the instructions for configuration use, but that's fine. We need to update the documentation at https://github.com/emqx/mqttx-site. After the update, I will introduce how to customize configuration packaging in a new blog post about mqttx-web.

[DM1-1]

@DM1-1 It seems that I haven't seen updates on the instructions for configuration use, but that's fine. We need to update the documentation at https://github.com/emqx/mqttx-site. After the update, I will introduce how to customize configuration packaging in a new blog post about mqttx-web.

I agree with your point that this content is indeed more suitable for presentation through an article.

[ysfscream]

@DM1-1 YES. But you still need to clearly these configs in the web docs on mqttx.app, I will directly refer to it later. Thank you.

[DM1-1]

@DM1-1 YES. But you still need to clearly these configs in the web docs on mqttx.app, I will directly refer to it later. Thank you.

OK. I will complete the web docs during my available time and ensure that it is promptly updated on mqttx.app.