Add compression for dist mode; README updates.

[mwistrand]

Resolves #11. Adds the compression-webpack-plugin and brotli-webpack-plugin plugins for compressing production builds with gzip and brotli, respectively. Also includes README documentation for each current "build-app" key in the .dojorc.

[codecov]

Codecov Report

Merging #24 into master will decrease coverage by 0.63%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
- Coverage   59.71%   59.08%   -0.64%     
==========================================
  Files           8        8              
  Lines         427      435       +8     
  Branches       92       93       +1     
==========================================
+ Hits          255      257       +2     
- Misses        172      178       +6

Impacted Files	Coverage Δ
src/dist.config.ts	34.54% <33.33%> (-1.63%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fcfa228...906b527. Read the comment docs.

[matt-gadd]

I'm not sure we can make the compression mode an or. brotli is not supported by all servers or browsers, so it should be complementary to gzip?

I'm also not sure about delegating the options off to the webpack plugins themselves as it seems to go against the minimal configuration, and the abstraction above webpack that the build command is designed to provide.

[mwistrand]

That's a fair point. I can update the rc to accept an array of option objects so that both can be generated side-by-side.

[mwistrand]

@matt-gadd This is ready for another review now that conflicts with master have been resolved.

[jsf-clabot]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

Matt Wistrand seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.