docs: add MkDocs documentation with Material theme and GitHub Pages deploy

docs/api.md

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+# API Reference
+
+## BaseRepository
+
+::: metaorm.repositories.BaseRepository
+    options:
+      show_source: true
+      members:
+        - __init_subclass__
+        - __init__
+        - get_items_count
+        - get_item
+        - get_items
+        - create_item
+        - update_items
+        - delete_items
+        - create_tables
+        - get_table_type
+        - get_filter_type
+        - get_dto_type
+
+## BaseTable
+
+::: metaorm.tables.BaseTable
+
+## RepositoriesContainer
+
+::: metaorm.container.RepositoriesContainer
+    options:
+      show_source: true
+
+## RepositorySettings
+
+::: metaorm.settings.RepositorySettings
+
+## Exceptions
+
+::: metaorm.exceptions.DatabaseException
+::: metaorm.exceptions.NotFoundError
+::: metaorm.exceptions.HaveNoSessionError
+::: metaorm.exceptions.AlreadyExistsError
+
+## Re-exports
+
+The following symbols are re-exported from `metaorm` for convenience:
+
+- `BaseFilter`, `BasePagination`, `BaseSort`, `OffsetPagination`, `PagePagination` — from `pydantic-filters`
+- `Field`, `Relationship` — from `sqlmodel`