* docs: explain create_empty_blocks configurations
Closes#3307
* Vagrantfile: install nodejs for docs
* update docs instructions
npm install does not make sense since there's no packages.json file
* explain broadcast_tx_* tx format
Closes#536
* docs: explain how transaction ordering works
Closes#2904
* bring in consensus parameters explained
* example for create_empty_blocks_interval
* bring in explanation from https://github.com/tendermint/tendermint/issues/2487#issuecomment-424899799
* link to formatting instead of duplicating info
* ungitignore
* add docs/.vuepress to enable local builds
* config.js needs to be here, one less step
* docs: make spec in sidebar nicer
* docs: local build instructions
