Adapter quikfinder

[jscheidtmann]

• Creates a adapters/quikfinder folder in ./case
• Quikfinder direct adapter, with optional orientation compatible with dovetail_top
• Added "Rigel Quikfinder Assembly" section to Build Guide -> Printed Parts -> Mounting

Will need to check links after merge.

Fixes #177

[brickbots]

Thank you @jscheidtmann for this great mounting option and for adjusting the documentation as needed which is very much appreciated. Thank you as well for the other little doc improvements/typo fixes you included. 💯

[brickbots]

PR's normally get merged into main, which is our development branch, and then released as part of a versioned software release. Since this is case/doc only, I'm going to merge it right to release, but it won't be announced until the next major versioned release where I'll make sure to include it even though it will be available immediately 👍