Update concept documentation for 1.0#2378

Merged

carolynvs merged 5 commits intogetporter:release/v1from carolynvs:concept-docs-1.0

Sep 30, 2022

+233-49

Commits on Sep 26, 2022

Fill out the Porter Architecture doc pages
carolynvs
committed

Commits on Sep 27, 2022

Document porter's security features
carolynvs
committed

Commits on Sep 28, 2022

Document how we run as a non-root user a bit more
carolynvs
committed

Commits on Sep 29, 2022