refactor: remove all dummy link, blog add git CheatSheet and froggit docs

blog.dist/2019-05-28-hola.md

blog.dist/2019-05-29-hello-world.md

blog.dist/2019-05-30-welcome.md

docs.dist/intro.md

docs.dist/tutorial-basics/_category_.json

docs.dist/tutorial-basics/congratulations.md

docs.dist/tutorial-basics/create-a-blog-post.md

docs.dist/tutorial-basics/create-a-document.md

docs.dist/tutorial-basics/create-a-page.md

docs.dist/tutorial-basics/deploy-your-site.md

docs.dist/tutorial-basics/markdown-features.mdx

docs.dist/tutorial-extras/_category_.json

docs.dist/tutorial-extras/manage-docs-versions.md

docs.dist/tutorial-extras/translate-your-site.md

docs/intro.md

docusaurus.config.js

src/pages/tarifs.md