feat: rename docs to next_docs

docs/en/api/io.rst

-IO
-==
-
-.. autoclass:: magic_pdf.data.io.base.IOReader
-   :members:
-   :inherited-members:
-   :show-inheritance:
-
-.. autoclass:: magic_pdf.data.io.base.IOWriter
-   :members:
-   :inherited-members:
-   :show-inheritance:
-
-.. autoclass:: magic_pdf.data.io.s3.S3Reader
-   :members:
-   :inherited-members:
-   :show-inheritance:
-
-.. autoclass:: magic_pdf.data.io.s3.S3Writer
-   :members:
-   :inherited-members:
-   :show-inheritance:
-
-.. autoclass:: magic_pdf.data.io.http.HttpReader
-   :members:
-   :inherited-members:
-   :show-inheritance:
-
-.. autoclass:: magic_pdf.data.io.http.HttpWriter
-   :members:
-   :inherited-members:
-   :show-inheritance:
-

docs/en/api/schemas.rst

-
-schemas 
-===========
-
-.. autopydantic_model:: magic_pdf.data.schemas.S3Config
-   :members:
-
-.. autopydantic_model:: magic_pdf.data.schemas.PageInfo
-   :members:
-

next_docs/en/api/io.rst

+IO
+==
+
+.. autoclass:: magic_pdf.data.io.base.IOReader
+   :members:
+   :inherited-members:
+   :show-inheritance:
+
+.. autoclass:: magic_pdf.data.io.base.IOWriter
+   :members:
+   :inherited-members:
+   :show-inheritance:
+
+.. autoclass:: magic_pdf.data.io.s3.S3Reader
+   :members:
+   :inherited-members:
+   :show-inheritance:
+
+.. autoclass:: magic_pdf.data.io.s3.S3Writer
+   :members:
+   :inherited-members:
+   :show-inheritance:
+
+.. autoclass:: magic_pdf.data.io.http.HttpReader
+   :members:
+   :inherited-members:
+   :show-inheritance:
+
+.. autoclass:: magic_pdf.data.io.http.HttpWriter
+   :members:
+   :inherited-members:
+   :show-inheritance:
+

next_docs/en/api/schemas.rst

+
+schemas 
+===========
+
+.. autopydantic_model:: magic_pdf.data.schemas.S3Config
+   :members:
+
+.. autopydantic_model:: magic_pdf.data.schemas.PageInfo
+   :members:
+