Use SVG

[Artoria2e5]

This commit does three things:

• Use SVG, which renders more cleanly than PNG and does not really require any fonts any more.
• Use monospace, a matter of personal taste that we can discuss later.
• Use classic colorsequence, which copes with > 8 sources much better.

Deployed at: https://esietb.com/ntp/index.html

[Artoria2e5]

Aight this is getting too funny, seeing how many svg PRs we have here. Don’t need another one I reckon!