deploy(contracts): uses @aragon/osx-commons-config for network inform…

…ation (#518)

* cicd(contracts): removes unused workflows and helpers

* docs: removes publishing info from readme
style: formats README with correct style

* deploy(contracts): uses network configuration from osx-commons-config

* deps(contracts): adds osx-commons-config as dep

* fix: revert wrong formatting of readme
dev: adds prettier as default formatter for md files within repo