removed all extra docusaurus tutorial and blogs related content

blog/2019-05-28-first-blog-post.md

blog/2019-05-29-long-blog-post.md

blog/2021-08-01-mdx-blog-post.mdx

blog/2021-08-26-welcome/docusaurus-plushie-banner.jpeg

blog/2021-08-26-welcome/index.md

blog/authors.yml

blog/tags.yml

docs/docusaurus-tutorials/intro.md

docs/docusaurus-tutorials/tutorial-basics/_category_.json

docs/docusaurus-tutorials/tutorial-basics/congratulations.md

...ocusaurus-tutorials/tutorial-basics/create-a-blog-post.md

...docusaurus-tutorials/tutorial-basics/create-a-document.md

docs/docusaurus-tutorials/tutorial-basics/create-a-page.md

.../docusaurus-tutorials/tutorial-basics/deploy-your-site.md

...ocusaurus-tutorials/tutorial-basics/markdown-features.mdx

docs/docusaurus-tutorials/tutorial-extras/_category_.json

...rus-tutorials/tutorial-extras/img/docsVersionDropdown.png

...cusaurus-tutorials/tutorial-extras/img/localeDropdown.png

...usaurus-tutorials/tutorial-extras/manage-docs-versions.md

...cusaurus-tutorials/tutorial-extras/translate-your-site.md