Add example and document for Dialog component

[SimeonC]

TK3 won't have a dedicated Dialog component like TK2 did. We need to add documentation for this and an example like here.

Reasoning for not creating a dedicated component this time around;

• Often all we need is what's provided in Radix-UI Dialog
• The new styling for a TK3 Dialog is very, very short and is trivial to implement with existing exported CSS properties and the Figma guidelines
• Often we found the need to work around the options, or add more for times when we needed no internal padding or similar. This lead to a fairly unweildly API with far too many options to be useful. We want to offload this complexity to the implementation so each project is not restricted by TK rules and can implement as needed.

Below is for reference - look to figma or the live documentation for most up to date

Desktop Style Guidelines

Mobile Style Guidelines