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-utils-validation/src/validationUtils.ts

@@ -99,24 +99,6 @@ export function normalizeThemeConfig<T>(
   return value;
 }
 
-// Enhance the default Joi.string() type so that it can convert number to strings
-// If user use frontmatter "tag: 2021", we shouldn't need to ask the user to write "tag: '2021'"
-// Also yaml tries to convert patterns like "2019-01-01" to dates automatically
-// see https://github.com/facebook/docusaurus/issues/4642
-// see https://github.com/sideway/joi/issues/1442#issuecomment-823997884
-const JoiFrontMatterString: Joi.Extension = {
-  type: 'string',
-  base: Joi.string(),
-  // Fix Yaml that tries to auto-convert many things to string out of the box
-  prepare: (value) => {
-    if (typeof value === 'number' || value instanceof Date) {
-      return {value: value.toString()};
-    }
-    return {value};
-  },
-};
-export const JoiFrontMatter: typeof Joi = Joi.extend(JoiFrontMatterString);
-
 export function validateFrontMatter<T>(
   frontMatter: Record<string, unknown>,
   schema: Joi.ObjectSchema<T>,