Describe the issue
In this section of textbook clearly two simulation methods are used Statevector and Qasm . But there is a problem in content as these simulation method are part of aer_simulator. One can clearly see that only aer_simulator is defined in code but the statevector and qasm are used in content.

Describe what you expect to see
I think one should fix the content and

Users may be tempted to use this function:
https://github.com/unitaryfund/mitiq/blob/2cb68d64a0f2ebfc98f6c3fbb03cb9c67f516cdf/mitiq/zne/scaling/folding.py#L240

with arbitrary scale factors. However this function, by construction, makes sense only if the scale factor is an odd integer.
We may sill keep the type of scale_factor as float for consistency with other methods, but we should che

It may be cool to have some counter of contributions showing up on the website, which could include from minimal to extensive information like the number of open PRs, commits, merged lines of code, contributors, etc.

If this were to update "live" or regularly, it could be very cool.

There may be some off-the-shelves tools such as github actions for this, see for example: https://github.com

Looking for a Zookeeper who can help manage and drive more algorithms to be implemented in the zoo!

https://github.com/qsharp-community/algorithm-zoo