feat: doc tags (same as blog tags) (#3646)

* [v2] tags to doc, same as tags to blog - [IN PROGRESS]

- Addition of plugin-content-docs

- Addition of DocTagsListPage in `docusaurus-theme-classic`

! Error exists for this commit towards the theme aspect and help required.

Commit towards #3434

* docs: make tags list page work

* temp: disable onBrokenLinks

* theme bootstrap: create DocTagsListPage

* DocTagsPage added and functionality too

- individual doc tag page added to show docs for that specific tag

* Added all Docs Tags Link

* add some shared tag utils

* move tag tests to _dogfooding

* fix type

* fix some tests

* fix blog test

* refactor blog post tags handling

* better yaml tag examples

* better dogfood md files

* refactor and factorize theme tag components

* finish DocTagDocListPage

* Extract DocItemFooter + add inline tag list

* minor fix

* better typings

* fix versions.test.ts tests

* add tests for doc tags

* fix tests

* test toTagDocListProp

* move shared theme code to tagUtils

* Add new theme translation keys

* move common theme code to tagUtils + add tests

* update-code-translations should handle theme-common

* update french translation

* revert add translation

* fix pluralization problem in theme.docs.tagDocListPageTitle

* add theme component configuration options

* add more tags tests

* add documentation for docs tagging

Co-authored-by: slorber <lorber.sebastien@gmail.com>

packages/docusaurus-plugin-content-blog/src/blogFrontMatter.ts

@@ -9,15 +9,16 @@ import {
   JoiFrontMatter as Joi, // Custom instance for frontmatter
   URISchema,
   validateFrontMatter,
+  FrontMatterTagsSchema,
 } from '@docusaurus/utils-validation';
-import {Tag} from './types';
+import type {FrontMatterTag} from '@docusaurus/utils';
 
 export type BlogPostFrontMatter = {
   /* eslint-disable camelcase */
   id?: string;
   title?: string;
   description?: string;
-  tags?: (string | Tag)[];
+  tags?: FrontMatterTag[];
   slug?: string;
   draft?: boolean;
   date?: Date | string; // Yaml automagically convert some string patterns as Date, but not all
@@ -38,23 +39,11 @@ export type BlogPostFrontMatter = {
   /* eslint-enable camelcase */
 };
 
-// NOTE: we don't add any default value on purpose here
-// We don't want default values to magically appear in doc metadatas and props
-// While the user did not provide those values explicitly
-// We use default values in code instead
-const BlogTagSchema = Joi.alternatives().try(
-  Joi.string().required(),
-  Joi.object<Tag>({
-    label: Joi.string().required(),
-    permalink: Joi.string().required(),
-  }),
-);
-
 const BlogFrontMatterSchema = Joi.object<BlogPostFrontMatter>({
   id: Joi.string(),
   title: Joi.string().allow(''),
   description: Joi.string().allow(''),
-  tags: Joi.array().items(BlogTagSchema),
+  tags: FrontMatterTagsSchema,
   draft: Joi.boolean(),
   date: Joi.date().raw(),