docs: Renames and moves files for nav redesign.

[edonehoo]

trafficstars

Closes #4753

This is a huge pr, but most changes are simple find/replace renaming in nav items, import statements, and embedded links to align with change to the top level navigation in a couple places, as well as a reorganization of the file structure to align more closely to the website structure (for easier future maintenance)

more notable changes to call out:

• updated nav order in patternfly-docs.config.js
• some updates to package.json to ensure compatibility with renaming/moving