Prevent need for npm build on glitch

[galtenberg]

Glitch isn't serving react in development mode, requiring express logic to send build/ artifacts (see https://github.com/galtenberg/evernote-random/blob/master/server/index.js#L21-L29).

Make those lines unnecessary / serve react ala development mode.

(When we do an official prod release, we'll definitely make a build.)