chore(jsdoc): wip

* Begin adding JSDoc comments
* Convert some classes to use new HXElement lifecycle methods.
  * `$onCreate`, `static get template`, `$onConnect`, `$onDisconnect`, `$onAttributeChange`
  * Update regression tests based on updates.

Author: Ryan A. Johnson

bin/start.js

@@ -40,6 +40,8 @@ browserSync.init({
                 `${CONFIG.docsDir}/**/*`,
                 `${CONFIG.sourceDir}/*.less`,
                 `${CONFIG.sourceDir}/helix-ui/styles/**/*.less`,
+                `!${CONFIG.docsDir}/api/*`,
+                `!${CONFIG.docsDir}/api/**/*`,
             ],
             fn: _.debounce(function () {
                 compileStyles();