URL as custom element

[trieloff]

This gets rid of the blocking diaglog

• wip: new url selector custom element
• feat(rum-explorer): use input field in custom element instead of dialog for URL entry
• fix(rum-explorer): disable url entry if no key in local storage

[aem-code-sync[bot]]

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Commits

* [0060a33](https://github.com/adobe/helix-website/commit/0060a334a68f6e1dc644bed1d25866c7c913d26d) :white_check_mark: (latest) * [5d1ded2](https://github.com/adobe/helix-website/commit/5d1ded261bcebfab42ee54b9ebe1306ca87dcaaa) :white_check_mark: * [480c3d3](https://github.com/adobe/helix-website/commit/480c3d30eac3ac324d889d87a0558b13900b182e) :white_check_mark: * [a7e1974](https://github.com/adobe/helix-website/commit/a7e19745dc93559c9330ae5ec80041ad6e7c976d) :white_check_mark: