Speedup builds

[ff6347]

A build takes around 5.5 minutes on netlify. In our current billing period for netlify.com 14.06-14.07 this already makes up 32.1% of all build time we have in our plan.

buils	avg build time	all
58	5m 33s	321m

What can we do?

• [ ] remove unused cruft
• [ ] review nuxt settings for builds
• [ ] incremental builds + caching + netlify cache plugin
  • https://nuxtjs.org/api/configuration-build/#cache
  • https://github.com/pizzafox/netlify-cache-nextjs
• [ ] review optimazitions
  • https://github.com/nuxt/nuxt.js/issues/5131
• [ ] review merging strategy add a staging branch which gets merged into master and only add deploy previews to that branch. Not desireable. Last resort.

@dnsos We should take this on pretty soon since @bnjmnsbl asked us also for adding the possibility to blog, the content will increase.

[jvolker]

Also, it takes around 14-18s to reload a page after a change using the dev server locally. Improving this could speed up development significantly.