[Keyboard] Move Keebio boards to own folder (#5109)

* Move boards into keebio folder

* Rename keymap

* Update BDN9 files

* Update BFO-9000 files

* Update Chocopad files

* Update Dilly files

* Update Fourier files, collapse rev1 into main

* Update Iris files

* Update Laplace files

* Update Levinson files, fix buswerks keymap

* Update Nyquist files

* Fix keymap issues

* Update Quefrency files

* Update Rorschach files

* Update TF68 files

* Update Viterbi files

* Update Viterbi files

* Update Wavelet files

* Reformat default layout

* Fix up default folder for Iris

* Remove already defined aliases

keyboards/keebio/levinson/keymaps/jyh2/readme.md

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+# jyh's levinson layout
+
+[Levinson](https://keeb.io/products/levinson-lets-split-w-led-backlight)
+built on rev2 PCBs. A split 4x12 keyboard with LED backlights.
+
+The layout is oriented towards needs for programming, Emacs, XMonad,
+and experience with 60% keyboards with no base layer arrow keys
+(Poker). It makes heavy use of modifiers and layers. It is influenced
+by good ideas from the Atreus keyboard layout.
+
+## Layout features
+
+  * Extensive use of _Mod Tap_, e.g.
+     * Tap sends Esc, Hold sends Left Control
+     * Tap sends Tab, Hold activates Numpad layer
+     * Tap sends  - , Hold sends Shift
+     * ... and many more
+  * Places Tab and Enter on bottom corners, for hitting with palm
+  * Meta is available on top corners, for controlling XMonad
+  * Control on center key, for Emacs (among other things)
+  * Backspace (Control Hold) and Space on center keys
+  * All 60% keys available on base layer, except for numbers
+  * Hyper and Meh keys
+  * Right modifier keys in place of arrow keys
+    * Arrows are instead available in two alternate locations:
+    * WASD arrows on _Adjust_
+    * Arrow cluster on _Raise_ (inspired by hexwire)
+  * Numpad and Numrow on _Raise_ layer. Each is faster in some contexts
+  * Function keys on _Lower_
+  * Dynamic macros from QMK firmware on _Adjust_
+  * Redunant keys where it is convenient to have characters together
+    on one layer