* Rework frontend code interacting directly with DOM
Rework frontend code that uses user-supplied data to render things like
comments and notes. In places where using React's built-in sanitization
is possible, the feature is used. In other places, where some markup
might be necessary, DOMPurify is used to sanitize the HTML before
rendering it.
Solves: GHSA-rh3r-8pxm-hg4w
* Remove test post DOM rework
* fixup! Rework frontend code interacting directly with DOM
