Added missing keyboards to main README

Added NerD 80% (TKL) support

Added NerD 60% support

Changed hotkey for bootloader jump

Merge branch 'rn42_integrate'

hhkb: Integrate RN-42 support, remove hhkb_rn42

hhkb_rn42: Move doc

hhkb: Fix layer stuck of keymap_hasu

- In mouse key layer with holding semicolon, press Fn0, release
  semicolon and release Fn0 now layer 1 is stuck.

Merge branch 'rn42'

rn42: Update doc

Use pgmspace for RN-42 commands

Increase buffer of rn42_gets() and change rn42_linked()

rn42: Add commands for RN-42

rn42: Add rn42_getc and rn42_gets

Fxi layer stuck of keymap_hasu

- In mouse key layer with holding semicolon, press Fn0, release
  semicolon and release Fn0 now layer 1 is stuck.

Update doc

Change RN42 state display

Fix power saving while USB suspended

- doesn't pwoer save while Bluetooth turns on

Add wait for charging capacitance of ADC S/H

Fix: enable digital input for PF5