bsc-quantic/Tangles.jl

AI Summary: Implement a function in Tangles.jl that removes an index from tensors without changing the tensor's size. This involves replacing the removed index with a new, unconnected index, effectively disconnecting tensors previously linked through that index. This differs from the existing `slice!` function, which modifies tensor size.

AI Summary: Implement a `neighbors` function in Tangles.jl (or potentially first in Networks.jl and then extend to Tangles.jl) that returns neighboring tensors and their corresponding indices. This function will likely involve graph traversal or similar techniques to identify neighboring elements within a tensor network.