Add bullet.ly as submodule

Author: SilverRainZ

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "_blobs"]
 	path = blobs
 	url = git@github.com:SilverRainZ/bullet.blobs.git
+[submodule "src/p/ly"]
+	path = src/p/ly
+	url = git@github.com:SilverRainZ/bullet.ly.git

conf.py

@@ -296,7 +296,7 @@
 extensions.append('sphinxnotes.lilypond')
 lilypond_audio_volume = 300
 lilypond_audio_format = 'mp3'
-lilypond_include_paths = ['/notes/man/lily/ly']
+lilypond_include_paths = ['/p/ly/inc']
 
 extensions.append('sphinxnotes.recentupdate')
 recentupdate_date_format = _datefmt