[Keyboard] Add boardsource/the_q

[waffle87]

Description

Adds new keyboard and migrates OLED code shared by 3 boards to common vendor-level directory.

Types of Changes

• [x] Keyboard (addition or update)
• [x] Keymap/layout/userspace (addition or update)

Checklist

• [x] My code follows the code style of this project: C, Python
• [x] 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.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] I have tested the changes and verified that they work and don't break anything (as well as I can manage).