Move the main page to @rocketseat/gatsby-theme-docs/text directory

Author: Andrei Jiroh Eugenio Halili

src/@rocketseat/gatsby-theme-docs/text/index.mdx

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+# Welcome to Code Server Boilerplates Docs!
+
+Want to deploy `code-server`, but don't have an Linux machine
+or you want to go to the cloud instead? Don't worry, we got you covered!
+[Get started](/user-guide/get-started) in minutes and you got an code-server
+instance in any Docker-supported (or Kubernetes) SaaS service you use.
+
+## Want to write your own?
+
+No problem!