Create intervals.html
Remove table of contents, as it will be included in the title page
Remove unused fonts
Adjust some webfonts and typography
Start basic layout
Add musical example for intervals
Continue writing chapter on intervals
Add some layout and type rules
Add pitches1 example
Add main-section function
Continue writing chapter
Tweaks
Adjust svg images so that they "float" left
Tweak images
Continue writing chapter
Finish first draft of intervals chapter
Adjust layout for two staff systems
Create examples for Intervals chapter