docs: add docusaurus docs

* Created website for the docs inside /docs

* remove old docs and home page

* fix wrong redirection path

* remove most of the docs from the readme

* fix docs path

* undo package.json changes

* remove unused images

* rename "how to" route

---------

Co-authored-by: Elias Schneider <login@eliasschneider.com>

.gitignore

@@ -38,6 +38,9 @@ yarn-error.log*
 # project specific
 /backend/data/
 /data/
+/docs/build/
+/docs/.docusaurus
+/docs/.cache-loader
 
 # Jetbrains specific (webstorm)
 .idea/**/**