[Breaking] Document and solidify the public API of FloatingUI

[NullVoxPopuli]

Resolves:

• Modifier cleanup needs improvement CrowdStrike/ember-velcro#149
• Document the floating ui wrapper #378

What:

• Moves away from velcro terminology that folks might not be familiar with if they've never looked super close at how velcro works
• Optimizes for the common case of only using a {{reference}} and {{floating}} modifier
• The modifier-only usage has been renamed to {{anchorTo}}

  <button id="#reference"> ... </button>
  <menu {{anchorTo "#reference"}}> ... </menu>

• Terms used for Popover have also changed to reflect the move away from "velcro"

Documentation:

• New page for Floating UI
  • Component usage
  • modifier usage
    • passing Selector
    • passing element
• Updates to the sidebar

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[github-actions]

Project	Preview URL
Docs	https://ed0054eb.ember-primitives.pages.dev

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