add support for showing changes (#88)

docs: remove irrelevant line

feat: allow configuring html title via a flag

build: dependency upgrades

feat: add tabular output (#17)

build: dependency upgrades

+linting fixes
+lint and vuln checks on CI

fix: handle missing env entries for html, plaintext

feat: allow user provided HTML templates

feat: declutter generated html

refactor!: generalize aws config source