feat(advdif): Add bl_height_factor option

fix(advdif): Correct gij size, square Ctau_{a,d}

- Correct gij size based on reference element size
- Ctau_{a,d} should be squared to align with 1D minreg definitions

feat(advdif): Add Boundary Layer IC, wind type

feat(advdif): Add diffusion tau coefficient

fix(advdif): Correct documentation form of tau

docs(advdif): Add flags for wave IC

doc: Documention divergence of F_diff projection

fix: Correct path for mesh in vortexshedding.yaml

chore: Move yamls, etc to examples directory

doc: Move test flags to bottom of options table

doc: Add building instructions to doc site

doc: Get documentation running