Firacode: Update documentation -- ligatures don't work in Notepad++

[alis0nc]

Ligatures don't work in Notepad++ (probably nothing else that uses the Scintilla editor component either). The documentation should be updated to reflect this.

[tonsky]

thanks!

[mmokross]

Got a work around in the Notepad++ community: https://github.com/notepad-plus-plus/notepad-plus-plus/issues/2287

The text rendering needs tweaked but you can do it with a plugin. Keep in mind support for ligatures is not officially supported so you might run into issues.
This is the easiest way I know (without recompiling) to get ligatures to work in Notepad++:

• Install a recent version of Fira Code (use either the normal font or the retina as those are the only ones that seem to work).
• Install LuaScript via the Plugin Manager (you can also use PythonScript if you are more comfortable with it or want to use a 10 ton hammer).
• Select the font via Settings > Style Configurator > Global Styles > Global Override. Select "Fira Code" for the font style and turn on Enable global font
• Edit the LuaScript startup file by doing Plugins > LuaScript > Edit Startup Script and add the following code:
  
  editor1.Technology = SC_TECHNOLOGY_DIRECTWRITE

editor2.Technology = SC_TECHNOLOGY_DIRECTWRITE
• Restart and enjoy.

[nelson6e65]

I added instrictions to the Wiki:
https://github.com/tonsky/FiraCode/wiki/Notepad-Plus-Plus-instructions