More extensive documentation on tether managment

[jonnew]

This attention block needs to be expanded:

commutator-docs/source/coax-commutator/user-guide/mount-connect.rst

Line 87 in f6260f9

.. Attention::

• We need a guide on how to use the hook and elastic thread to keep the tether away from the animal.
• Diagrams and pictures would be useful for this.

[cjsha]

Attempted fix with commit 5cd8aba

[jonnew]

Just closed, but realized I have not gotten a part number for the elastic thread yet.

[jonnew]

Here is the part number for the elastic thread:

Clover 3158

https://theknittersattic.co.uk/product/elastic-yarn-thread-black/

@cjsha please add this and feel free to close afterwards.

[cjsha]

A new issue was created #20 with a bit more details. I'm closing this one and I'll do a PR for #20.