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-theme-bootstrap/src/theme/DocTagsListPage/index.tsx

@@ -0,0 +1,39 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import Layout from '@theme/Layout';
+import Link from '@docusaurus/Link';
+import type {Props} from '@theme/BlogTagsListPage';
+
+function DocTagsListPage(props: Props): JSX.Element {
+  const {tags} = props;
+  const renderAllTags = () => (
+    <>
+      {Object.keys(tags).map((tag) => (
+        <Link
+          href={tags[tag].permalink}
+          key={tag}
+          className="btn btn-primary list-inline-item my-2">
+          {tags[tag].name}{' '}
+          <span className="badge badge-light">{tags[tag].count}</span>
+        </Link>
+      ))}
+    </>
+  );
+
+  return (
+    <Layout title="Tags" description="Blog Tags">
+      <div className="container my-3 justify-content-center">
+        <h1 className="text-primary">Tags</h1>
+        <ul className="my-xl-4 list-inline">{renderAllTags()}</ul>
+      </div>
+    </Layout>
+  );
+}
+
+export default DocTagsListPage;