Cardano Updates

Following the instructions on how to build the node via cabal on MacOS, I ran
into an error when cabal tried to buid cardano-lmdb (it didn't find lmdb in the
pkg-config database).

Adding `brew install lmdb` to the instructions fixes this.

* update aiken language definition in prism

* enable light code blocks

* smart contract security documentation with new sections

* design patterns

* consistent cardano-cli commands era flags

* remove duplicate link

* cardano-cli era flags update

* refactor testnet docs and add redirects

* infrastructure docs refactor

* refactor core concepts & get started

* fix broken testnet links

* revert secure-workflow.md to staging to avoid merge conflict with #1690

* update redirects for additional path to running cardano node docs