Remove some deadwood

.prettierignore

@@ -98,11 +98,5 @@ build-tests/*/etc
 dist-dev
 dist-prod
 
-# Prettier doesn't understand the /*[LINE "HYPOTHETICAL"]*/ macros in these files:
-apps/rush-lib/assets/rush-init/
-
-# These are intentionally invalid files
-libraries/heft-config-file/src/test/errorCases/invalidJson/config.json
-
 # We'll consider enabling this later; Prettier reformats code blocks, which affects end-user content
 *.md