* tke updates

* Fix shear velocity functions

* More detail for tke shear production

* Don't rotate heading beyond 360 degrees

* Fix some typos in notebook

* Rename deprecated function

* Test: Determine method using input frequency index

* Feat: Use sum of sines if ifft is not computable

This change allows `surface_elevation` to return a result if the user
inputs a spectrum with a frequency index that does not have a zero
frequency.

If the non zero frequency index condition is found when the method is
`ifft` we warn the user and change the method to `sum_of_sines`

* Fix: Use previously found frequency index

S.index may not exist for some input datasets, but f[0] does and we
should use the value of f[0] here.

* Test: Warn when using ifft with a non zero frequency

* Lint

This PR adds a Github action to test the example notebooks as part of or CD pipeline. Additionally a timeout is added to which notebooks will fail if they exceed the given time.

Fixes #223

This PR addresses #315 by:
- Changes the data called by the Wind Toolkit tests so that they run faster
- Updates the .csv files that the tests compare against
- Updates a few descriptions in the metocean example, fixes a sorting issue, reduces the data downloaded there
- Tests in hindcast match the notebooks and use the same cache.

Bug fix by removing matplotlib version check needed for < 3.8.0

*MHKiT  v0.8.2