Adds long awaited linalg tutorial

[dsirianni]

Description

Adds an overview linear algebra tutorial, adapted from Psi4Education, which introduces vectors, matrices, & tensors and their operations, as well as comparing contraction engines.

What are your new additions? Please provide a brief list.

• New Features
  • [x] Overview of vectors, matrices, & tensors and their Python representations
  • [x] Introduces both manual & NumPy contraction engines, including a by-hand matrix mult exercise

Any questions for the community?

• [ ] Any additional topics to be covered in this lab, or in additional linear algebra labs? (I already have an idea for eigenproblems)

Status

• [x] Click when ready for review-and-merge