[Doc] V0.3.1 doc refactor for single machine graph construction

[zhjwy9343]

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Description of changes: This PR add two major rst files for the single machine graph construction documentations, including:

• A new Input Raw Data Explanation rst to describe the input tables and give an example.
• A new Single Machine Graph Construction rst to explain the gconstruct command and the JSON file.

This PR also fixes two minor typos in GSF model training/inference configuration rst.

1. change --return_proba to --return-proba;
2. delete decoder_norm section as none of decoders actually use normalization method even have this argument as input.

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