docs: add API report update for declarative elements, lazy elements, …

…DOM parts, and custom attributes (#41)

* chore: add name to editors lists

* docs: update introduction for dom parts, laze elements, and custom attrs

* docs: add details for Declarative Custom Elements

* docs: add details for Lazy custom element definitions

* docs: add details for DOM Parts API

* docs: add details for Custom Attributes

* docs: add discussion link for declarative custom elements

* fix: attempt to escape characters

Co-authored-by: Westbrook Johnson <westbrook.johnson@gmail.com>