docs(mddocs): add strategy from docs_rework

mddocs/strategy/incremental_batch_strategy.md

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+# Incremental Batch Strategy { #incremental-batch-strategy-0 }
+
+<!--
+    ```{eval-rst}
+    .. currentmodule:: onetl.strategy.incremental_strategy
+    ```
+
+    ```{eval-rst}
+    .. autoclass:: IncrementalBatchStrategy
+        :members: __init__
+    ```
+ -->
+
+::: onetl.strategy.incremental_strategy.IncrementalBatchStrategy
+    options:
+        members:
+            - __init__

mddocs/strategy/incremental_strategy.md

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+# Incremental Strategy { #incremental-strategy-0 }
+
+<!--
+    ```{eval-rst}
+    .. currentmodule:: onetl.strategy.incremental_strategy
+    ```
+
+    ```{eval-rst}
+    .. autoclass:: IncrementalStrategy
+        :members: __init__
+    ```
+ -->
+
+::: onetl.strategy.incremental_strategy.IncrementalStrategy
+    options:
+        members:
+            - __init__

mddocs/strategy/index.md

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+# Read Strategies { #strategy }
+
+onETL have several builtin strategies for reading data:
+
+1. [Snapshot Strategy][snapshot-strategy-0]
+2. [Incremental Strategy][incremental-strategy-0]
+3. [Snapshot Batch Strategy][snapshot-batch-strategy-0]
+4. [Incremental Batch Strategy][incremental-batch-strategy-0]

mddocs/strategy/snapshot_batch_strategy.md

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+# Snapshot Batch Strategy { #snapshot-batch-strategy-0 }
+
+<!--
+    ```{eval-rst}
+    .. currentmodule:: onetl.strategy.snapshot_strategy
+    ```
+
+    ```{eval-rst}
+    .. autoclass:: SnapshotBatchStrategy
+        :members: __init__
+    ```
+ -->
+
+::: onetl.strategy.snapshot_strategy.SnapshotBatchStrategy
+    options:
+        members:
+            - __init__

mddocs/strategy/snapshot_strategy.md

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+# Snapshot Strategy { #snapshot-strategy-0 }
+
+<!--
+    ```{eval-rst}
+    .. currentmodule:: onetl.strategy.snapshot_strategy
+    ```
+
+    ```{eval-rst}
+    .. autoclass:: SnapshotStrategy
+        :members: __init__
+    ```
+ -->
+
+::: onetl.strategy.snapshot_strategy.SnapshotStrategy
+    options:
+        members:
+            - __init__