[Feature Proposal] Append additional html in to console ui

[wantg]

Proposal

Add a additional console option in Server Configuration
Like

Parameter	Flag	Description
address	console.additionalHTML	Append additional html in to console

Inspired by Nginx addition module
https://nginx.org/en/docs/http/ngx_http_addition_module.html#add_after_body

Example:

server-configuration.yml

console:
  port: 7351
  username: "chief"
  password: "password"
  additionalHTML: /nakama/data/additional.html

/nakama/data/additional.html

<style></style>
<script>
  // add custom feature button in left menu
</script>

Console

[linear]

NK-1657 [Feature proposal] append additional html in to console ui