This adds some code to drop the Element suffix from class names when they get converted to a tag, so for example:

• HelloWorldElement becomes <hello-world>
• UserListElement becomes <user-list>
• TeamMembersElement becomes <team-members>

This is a backwards incompatible change, as any previous elements registered with an Element suffix will now have different tag names, but we're still pre 1.0 so this won't necessitate a major version bump.

This does not affect any existing classes suffixed with Controller, they will remain the same.

This also updates the docs to reflect these changes. A lot of the docs changes overlap with #42 but we won't close that issue as it has other useful changes.

Relevant docs changes