Move Idobao keyboards to a dedicated Idobao path

[silvinor]

Description

This is a minor clean-up of the keyboards folder, moving the 5 known Idobao keyboards (ID67, ID75, ID80, ID87 and Montex) to a dedicated Idobao folder. Also:

• Minor mods to the readme's to show compile command with the extra path.
• Rename the idobo folder (incorrect spelling, and model not apparent) to ID75.

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization (clean up of Idobao folders)
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Issues Fixed or Closed by This PR

n/a

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).

[drashna]

This has some merge conflicts that need to be addressed.

[silvinor]

@drashna - sorry, I can't fix the conflicts from here. I'll close this PR and open another (#14369)