feat(v2): Improve the initial templates #4302 (#4320)

* feat: add getting started doc at classic inital templates

* fix: improve the contents of getting started page

* fix: fix slug routing

* fix: rename gettingStarted to getting-started and re-adjust the content

* feat: add markdown-features docs

* feat: add a page on how to create a simple document

* feat: add a page on how to create pages

* feat: add create a post doc

* feat: add thank you page with whats next

* feat : update sidebar.js

* feat : add introduction content

* feat : add self hosting content

* feat : add GitHub pages content

* fix : remove automatically deploying with github actions content

* feat : add deploying to netlify

* feat : add Translate your site

* add : Manage versions

* fix : formatted docs with prettier

* Revert "fix : formatted docs with prettier"

This reverts commit af8c0b48

* run prettier to init templates with fixes

* complete new init template

* rename manage-docs-versions

* change wording

* refresh config file

* rework init template homepage

* minor changes

Co-authored-by: Lisa Chandra <52909743+lisa761@users.noreply.github.com>
Co-authored-by: Javid <singularity.javid@gmail.com>
Co-authored-by: ShinteiMai <stevenhanselgo@gmail.com>
Co-authored-by: slorber <lorber.sebastien@gmail.com>

packages/docusaurus-init/templates/classic/docusaurus.config.js

@@ -1,7 +1,7 @@
 /** @type {import('@docusaurus/types').DocusaurusConfig} */
 module.exports = {
   title: 'My Site',
-  tagline: 'The tagline of my site',
+  tagline: 'Dinosaurs are cool',
   url: 'https://your-docusaurus-test-site.com',
   baseUrl: '/',
   onBrokenLinks: 'throw',
@@ -18,12 +18,12 @@ module.exports = {
       },
       items: [
         {
-          to: 'docs/',
-          activeBasePath: 'docs',
-          label: 'Docs',
+          type: 'doc',
+          docId: 'getting-started',
           position: 'left',
+          label: 'Tutorial',
         },
-        {to: 'blog', label: 'Blog', position: 'left'},
+        {to: '/blog', label: 'Blog', position: 'left'},
         {
           href: 'https://github.com/facebook/docusaurus',
           label: 'GitHub',
@@ -39,7 +39,7 @@ module.exports = {
           items: [
             {
               label: 'Getting Started',
-              to: 'docs/',
+              to: '/docs/',
             },
           ],
         },
@@ -65,7 +65,7 @@ module.exports = {
           items: [
             {
               label: 'Blog',
-              to: 'blog',
+              to: '/blog',
             },
             {
               label: 'GitHub',