✨ Feature: Blog post on preferring unknown over any

### Feature Request Checklist - [X] I have [searched for related issues](https://github.com/LearningTypeScript/site/issues?q=is%3Aissue+label%3A%22type%3A+feature%22) and found none that matched my issue. - [X] This is the appropriate issue form for the feature I would like to request. ### Feature Searching phrases like _"prefer unknown over any"_ and _"difference between unknown and any"_ show a surprising lack of consolidated single explainers on the subject. I've found this to be something I've needed a quick reference for in several pull request reviews lately. Time for an article. ### Additional Info https://typescript-eslint.io/rules/no-explicit-any/ is definitely relevant.