Change LitElement and site to Lit and lit.dev (#889)

docs/getting-started/overview.md

@@ -117,7 +117,7 @@ Designing, developing, and supporting this library requires a lot of time, effor
 
 Special thanks to the following projects and individuals that help make Shoelace possible.
 
-- Components are built with [LitElement](https://lit-element.polymer-project.org/)
+- Components are built with [Lit](https://lit.dev/)
 - Component metadata is generated by the [Custom Elements Manifest Analyzer](https://github.com/open-wc/custom-elements-manifest)
 - Documentation is powered by [Docsify](https://docsify.js.org/)
 - CDN services are provided by [jsDelivr](https://www.jsdelivr.com/)