Keyboard: Shuffle keyboards into thevankeyboards directory (#3895)

* move tv44 to thevankeyboards directory

* move bananasplit to thevankeyboards

* move roadkit to thevankeyboards directory

* add a basic readme

* update readmes to correct the make instructions and add more help text

* rename tv44 to minivan as per Jack's suggestions

* update readme

* rename tv44 to minivan

* update tv44 to minivan

* change includes for tv44 to minivan

* remove extra includes

keyboards/thevankeyboards/minivan/keymaps/core/readme.md

@@ -0,0 +1,18 @@
+# A minivan keymap based off the Vertex Core
+
+## Main differences
+
+* There are only 3 keys on the bottom right, so menu was dropped
+* There are only 3 keys on the bottom left, so Pn was dropped because there is
+  no programmable layer.
+* There are only 12 keys in the first row, so the delete key (along with scroll
+  lock) has been dropped.
+* The F1-F12 keys have been shifted by 1 so they all fit in the first row of
+  layer 2.
+* Moved the grave/tilde to layer 1 (because in layer 2 it's now taken up by F1).
+* Keys relating to speed have been removed
+* The `L_Win + L_Alt + R_spacebar = R_Shift, R_Alt, Menu and R_Ctrl as arrow
+  keys` as mentioned in the manual does not work.
+* The layer 2 plus shift should have support for symbols in the first row (where
+  the F1-F12 keys are) but this has not been implemented, so you need to use the
+  second row (where the numbers are).