refactor(docs): simplify docs files / pipelines (#9633)

* refactor(doc): only use one command

* restructure

* move all generated helpers to a dedicated directory

* move to pathlib

* and more pathlib

* add empty generated folder

.gitignore

@@ -113,8 +113,3 @@ api.yaml
 # web frontend (static files)
 src/backend/InvenTree/web/static
 InvenTree/web/static
-
-# Exported interim files
-docs/schema.yml
-docs/docs/api/*.yml
-docs/docs/api/schema/*.yml