0.2.0

0.2.0

• Add Attention base class, MultiHeadAttention, and ScaledDotProductAttention classes.
• Add branch_network and trunk_network arguments to DeepONet to allow for custom network architectures.
• Add MaskedOperator base class.
• Add DeepCatOperator.
• Restructure documentation, separating notebooks into tutorials and how-to guides.