Use better JSDoc theme

[larsgw]

I changed a few things already in the current theme (Minami):

• code highlighting theme
• code font size (mainly in headings)
• table styling (there weren't even any borders)
• contrast between methods
• favicons
• theme colors

Other features I'd like:

• a more expansive navigation (i.e. showing sub-tutorials, listing sub-namespaces as such, etc.)
• in-page navigation
• proper distinction between doclets
• a more automated way to add favicons
• proper layout for windows wider than ~700px
• proper layout in doclets
• auto-generated examples
• more readable method signatures
• clearer references to related content and tutorials
• headers that are actually clickable to easily get the page hash to link to

Some other cool, but perhaps unnecessary things:

• manifest.json
• Service Workers for offline functionality
• customisable color schemes (and perhaps fonts etc.)
• search functionality
• schema.org integration (the Google CSE results were somewhat disapointing) [EDIT: schema.org probably won't fix that, but perhaps some other schema]