Switch from Handlebars to Mustache

[PaulRBerg]

Mustache is only 110 kB in size, while Handlebars a whopping 2.72 MB.

It's true that TypeScript is smart and doesn't include the unused code from the Handlebars package, but I suspect that the resulting build would be smaller with Mustache nonetheless.

[PaulRBerg]

Wait, I'm not sure we can do this:

We call Mustache "logic-less" because there are no if statements, else clauses, or for loops. Instead there are only tags. Some tags are replaced with a value, some nothing, and others a series of values.

We do use if-else statements and for loops in Create Eth Ap.