Use rollup

[SKalt]

Addresses #56, #42, and #84.
Tests should all pass, but before approving, you should verify the raster layer works as expected. https://github.com/klokantech/vector-tiles-sample has an example raster .mbtiles that you can download, though it's only available at low zoom. I didn't write tests on top of that since the repo is unlicensed (though I did put in a ticket about that).

[andrewharvey]

any idea where it pulls public from without setting _dirname + '/... ?

I just opened #96 which would conflict with this change, but without making the change mbview was broken for me.

[SKalt]

My guess would express.static looks for "public" in your current working directory.

I couldn't find any docs with a definite answer.

None of

• https://expressjs.com/en/starter/static-files.html
• https://expressjs.com/en/4x/api.html#express.static
• https://expressjs.com/en/resources/middleware/serve-static.html
  have an answer that I could find.

[SKalt]

I couldn't find a single directory with that name, even in node_modules. You're definitely safe to nuke that line.

# in root of repo
docker run -it $(pwd):/root node:12-alpine sh
cd && rm -rf ./node_modules && npm ci && find . -type d -name public
echo $? && exit