Remove ortho_*x13 Community Layouts

[dunk2k]

Description

requesting removal of the following Community Layouts:

• ortho_5x13
• ortho_6x13

due to the low/no uptake in keyboards/ and lack of matching sub-directories in layouts/community directory

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

• 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]

Honestly, low adoption or not, I'd rather leave these in.

[dunk2k]

Honestly, low adoption or not, I'd rather leave these in.

More than happy to close this PR if general consensus agrees.
What is also somewhat irksome is no keyboards have been with assigned either of the identified Community Layouts 🫤

[alinelena]

I can pr my keyboards that use that layouts in, will they be accepted is a different matter.