[Keyboard] Remove file with same name and different case (#6028)

keyboards/tada68/keymaps/hhkb68/README.md

@@ -1,2 +0,0 @@
-# HHKB68
-Layout to closely match the primary and function layers of the HHKB.

keyboards/tada68/keymaps/hhkb68/readme.md

@@ -1,13 +1,2 @@
-# Generated Keymap Layout
-
-This layout was generated by the QMK API. You can find the JSON data used to
-generate this keymap in the file layers.json.
-
-To make use of this file you will need follow the following steps:
-
-* Download or Clone QMK Firmware: <https://github.com/qmk/qmk_firmware/>
-* Extract QMK Firmware to a location on your hard drive
-* Copy this folder into %s
-* You are now ready to compile or use your keymap with the source
-
-More information can be found in the QMK docs: <https://docs.qmk.fm>
+# HHKB68
+Layout to closely match the primary and function layers of the HHKB.