Integrate architect supported runtime list #764
Description
Is your feature request related to a problem? Please describe.
As a maintainer, it's a pain to have to be vigilant about runtime labels and versions. They change on lambda regularly, which is why architect maintains the lambda-runtimes package: https://github.com/architect/lambda-runtimes
Describe the solution you'd like
It would be rad to figure out a way to integrate runtime version referencing within the doc in a way that, as the runtime support in arc is updated, the documentation references are also automatically updated.
If a solution to this could be employed in the docs, then maybe it could be employed in e.g. the architect CLI help text, too.
Additional context or notes
Just search for python3 or nodejs in the docs and you'll see how prevalent these terms are, and it takes regular pruning to keep them accurate!