Chatra and Tidio chats service

[1v9]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines.
• Tests for the changes was maked (for bug fixes / features).
  • Muse | Mist have been tested.
  • Pisces | Gemini have been tested.
• Docs in NexT website have been added / updated (for new features).

PR Type

What kind of change does this PR introduce?

• Bugfix.
• Feature.
• Code style update (formatting, local variables).
• Refactoring (no functional changes, no api changes).
• Build related changes.
• CI related changes.
• Documentation content changes.
• Other... Please describe:

What is the current behavior?

Issue resolved: #577

What is the new behavior?

• enable all chat services

• Mist, enable chatra sidebar button

• Pisces, enable tidio sidebar button

How to use?

In NexT _config.yml:

• sidebar button

# A button to open designated chat widget in sidebar.
# Firstly, you need enable the chat service you want to activate its sidebar button.
chat:
  enable: true
  #service: chatra
  service: tidio
  text: Chat # button text, change it as you wish

• chat service

# Chatra Support
# See: https://chatra.io
# Dashboard: https://app.chatra.io/settings/general
chatra:
  enable: true
  async: true
  id: <ChatraID> # visit Dashboard to get your ChatraID
  #embed: # unfinished experimental feature for developers, See: https://chatra.io/help/api/#injectto

# Tidio Support
# See: https://www.tidiochat.com
# Dashboard: https://www.tidiochat.com/panel/dashboard
tidio:
  enable: true
  key: <public key> # Public Key, See: https://www.tidiochat.com/panel/settings/developer

Does this PR introduce a breaking change?

• Yes.
• No.

[ivan-nginx]

Yeah, seems pretty good! From now it can be live communication in site, not only in comments as before.

[daya0576]

This feature is so cool, I love it, but it takes a bit long to load JS files(localhost), any suggestions?