Increase comment coverage (#180)

* Split components into dedicated files

* Revise code comments in the components

* Revise code comments in the elements

* Revise code comments of the attributes

* Revise the code comments of the tokens

Author: mattesmohr

Sources/HTMLKit/Abstraction/Attributes/AriaAttributes.swift

@@ -1,11 +1,3 @@
-/*
- Abstract:
- The file contains the protocols for the aria html-attributes.
- 
- Note:
- If you about to add something to the file, stick to the official documentation to keep the code consistent.
- */
-
 @_documentation(visibility: internal)
 public typealias GlobalAriaAttributes = AriaAtomicAttribute & AriaBusyAttribute & AriaControlsAttribute & AriaCurrentAttribute & AriaDescribedAttribute & AriaDetailsAttribute & AriaDisabledAttribute & AriaErrorMessageAttribute & AriaFlowToAttribute & AriaPopupAttribute & AriaHiddenAttribute & AriaInvalidAttribute & AriaShortcutsAttribute & AriaLabelAttribute & AriaLabeledAttribute & AriaLiveAttribute & AriaOwnsAttribute & AriaRelevantAttribute & AriaRoleDescriptionAttribute