[Docs]: supports online preview of other APISIX repository documents.

[guitu168]

Current State

Description of the current state/issue:

Among all Apache APISIX projects, only apisix-website documents and blogs support online preview, and other repositories do not support online preview. This increases the difficulty of review. If we can support online preview in each repository, it will greatly reduce the low error of the document.
It is hoped that the documentation of other APISIX repo will also support online preview.
#582
apache/apisix#6957 (comment)

Desired State

Description of the change you are proposing:

Would you like to fix this issue?

No response

[SkyeYoung]

To solve this problem, we need to do below things:

• Add netlify-related tokens to this repo
• Implementing Deployment Preview to netlify in Website (GitHub Actions) refactor(deploy.yml): deploy to netlify #1081
• Allow pull current branch
• Add labeler to determine what needs to be rendered (GitHub Actions)
• Allows custom site configuration in different repositories for minimal deployment
• Add netlify-related tokens to other repositories
• Adding Preview Tasks to other repositories (GitHub Actions)

cc @juzhiyuan @moonming

[juzhiyuan]

Link to #1081