fix: resolve critical and high security vulnerabilities (#11848)

* fix: resolve critical and high security vulnerabilities across packages

Bump vulnerable dependencies and remove unused `request` package to
address ~351 of ~394 npm audit vulnerabilities reported by GitHub.

* fix: handle nullable textContent from @mozilla/readability v0.6.0

readability.textContent can be undefined in v0.6.0, add nullish
coalescing to satisfy ArticleComponent.body type constraint.