Remove ee_hands config from ferris/sweep firmware

[keyboard-magpie]

Description

For some reason ferris/sweep was configured with EE_hands as its default handedness method. This provides no real benefit, and confuses new users (sweep is one of our most searched for boards according to analytics).

I've deleted the config.h with the ee_hands define meaning it should fall back to MASTER_LEFT by default, and deleted all the extra stuff in readme.md that related to it.

Just aiming to simplify new users experience with this very popular board.

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[Laobiz]

I currently have a problem where I am trying to set this up. Both boards are now seen as MASTER_LEFT and are not communicating with each other. Can this be related to that change?
I am flashing with the following commands:

qmk flash -e CONVERT_TO=liatris -kb ferris/sweep -km default -bl uf2-split-left
qmk flash -e CONVERT_TO=liatris -kb ferris/sweep -km default -bl uf2-split-right