Prepare sticky for release

[justinbmeyer]

• add tests
• make a single file (get rid of require)
• should it export the constructor or assign the element name
• remove container
• do we want to use selector like this does: https://github.com/bit-docs/bit-docs-html-toc
  • heading-selector="h2"
  • scrollable-container-selector="body"
  • stick = "true"
• Change Navbar to nav
• hard coding what is scrolling
• listen to resize
• remove using ids to listen to elements
• remove the offsetTop -70.
• header being added inside a form element

Styling

• remove outer element

Testing

• Create a test page that uses ESModules for now to import the webcomponent and use.
• Write up the major test cases in an issue

Memory safety

• Listening to scroll is not torn down.

[jmlawrence]

Addressed issues.