feat: allow to use x-tagGroups extension to define tree structure

[weyert]

Allow to use the x-tagGroups and x-displayName vendor extensions to define the structure of table of contents

fixes #1390

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[mnaumanali94]

@weyert Can you provide an explanation of what this does and some documentation please.

[weyert]

@weyert Can you provide an explanation of what this does and some documentation please.

@mnaumanali94 If the x-tagGroups-extension exists in the specification it will go to a different code path which uses the extension as defined by Redocly to generate the structure. This should fix issue #1390

See screenshot:

or see: https://deploy-preview-2603--stoplight-elements.netlify.app/?path=/story/public-api--with-tag-groups

The relevant vendor extension definition in the spec:

{
"tags": [
     {
       name: 'Todos',
       'x-displayName': 'To-dos',
     },
     {
       name: 'Retrieval',
       'x-displayName': 'Retrieve To-do Items',
     },
     {
       name: 'Management',
       'x-displayName': 'Add/remove To-do Items',
     },
],
'x-tagGroups': [
     {
       name: 'Todos',
       tags: ['Retrieval', 'Management'],
     },
]
}

[mnaumanali94]

This doesn't solve the problem of showing description for tags? Did you intend to add that too?

[weyert]

@mnaumanali94 It allows you use a different text for a tag in the site navigation.

I am not sure what intended use case of showing a description alongside the tag name is.