Document the issue of stuck modifiers

Fix the layer-dependent modifiers handling

Closes #181.

Merge pull request #180 from NoahAndrews/add-build-instructions

Added build instructions to BUILD_GUIDE.md

Added build instructions to BUILD_GUIDE.md

Merge pull request #179 from NoahAndrews/add-win-linux-instructions

Added Windows and Linux instructions to BUILD_GUIDE.md

Added Windows and Linux instructions to BUILD_GUIDE.md

Merge pull request #176 from NoahAndrews/fix-new-projects

Fix building new projects

Remove extraneous comma

Merge pull request #171 from NoahAndrews/restructure-documentation

Restructure documentation

Merge pull request #170 from NoahAndrews/improve-windows-docs

Add scripts for easy Windows environment setup

Merge pull request #165 from deepshitgoeshere/deepshitgoeshere-master

added planck keymap and troubleshooting part in the PCB guide

Merge pull request #175 from NoahAndrews/fix-#174

Fix #174

Fix #174

Merge pull request #172 from plgruener/pr1

add missing keys to keymap_neo2.h

update neo keymap

Clarified recommended Mac setup method

Updated README to point to new build guide

Added Mac section (copy/pasted from PCB_GUIDE.md)

Renamed handwriting guide to fit repository convention

Added placeholder for windows section of build guide