move input club keyboards into vendor folder (#15788)

keyboards/input_club/ergodox_infinity/readme.md

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+# ErgoDox Infinity
+
+The Infinity is two completely independent keyboards, and needs to be flashed
+for the left and right halves seperately.  To flash them:
+
+  - Make sure you are in the top-level qmk_firmware directory
+
+  - Build the firmware with `make input_club/ergodox_infinity:keymapname`
+
+  - Plug in the left hand keyboard only.
+
+  - Press the program button (back of keyboard, above thumb pad).
+
+  - Install the firmware with `sudo make input_club/ergodox_infinity:keymapname:dfu-util`
+
+  - Plug in the right hand keyboard only.
+
+  - Press the program button (back of keyboard, above thumb pad).
+
+  - Install the firmware with `sudo make input_club/ergodox_infinity:keymapname:dfu-util`
+
+More information on the Infinity firmware is available in the [TMK/chibios for
+Input Club Infinity Ergodox](https://github.com/fredizzimo/infinity_ergodox/blob/master/README.md)
+
+## Infinity Two Halves
+
+The Infinity is two completely independent keyboards, that can connect together.
+You have a few options in how you flash the firmware:
+
+- Add `#define EE_HANDS` to your config.h, initialize the EEPROM values (see below),
+  and then flash the same firmware to both halves.
+
+- Flash with the instructions above, which assume the left hand is connected to USB.
+
+- For minor changes such as changing only the keymap without having updated
+  any part of the firmware code itself, you can program only the half connected to USB,
+  but it is safest to program both halves.
+
+### EE_HANDS initialization
+
+To initialize the EEPROM values for `EE_HANDS` to work properly, these steps should work.
+They only need to be done once, unless you reset the EEPROM later.
+
+  - Plug in the left keyboard half to the computer, and press its program button.
+
+  - Flash the left half with `make input_club/ergodox_infinity:default:dfu-util-split-left`
+    (If you need to use a different method to flash your keyboard, still run this command,
+    and abort it with Ctrl+C when the flashing attempts starts to print errors,
+    then flash the built firmware).
+
+  - On the left half, press the top vertical 1.5U key (second from the top in the rightmost column) once,
+    then the 1U key at the bottom in the opposite corner (bottom left corner).
+
+  - Plug in the right keyboard half to the computer, and press its program button.
+
+  - Flash the right half with `make input_club/ergodox_infinity:default:dfu-util-split-right`
+
+  - On the right half, press the top vertical 1.5U key (second from the top in the leftmost column) once,
+    then the 1U key at the bottom in the opposite corner (bottom right corner).
+
+  - Add `#define EE_HANDS` to the config.h file of your keymap, and build your firmware using
+    `make input_club/ergodox_infinity:keymapname`.
+
+  - After this, you can flash both halves with the same firmware, _without_ risking a mirrored keyboard when connected the wrong way.
+    If you reset your EEPROM later, you'll have to follow these steps again, though.
+