styles, externalize loader, handle no results

[langswei]

Minor style updates, moved loader CSS and javascript out of each block, added logic to display message when no results are found - either due to legitimately no results or empty domainkey and url params (which happens when using standard Franklin preview/publish functionality).

Test URLs:

• Before: https://main--franklin-dashboard--adobe.hlx.live/views/rum-dashboard?domainkey=8e884fda-f644-4708-b583-a4b0715068cd&url=www.hlx.live
• After: https://dash-styles--franklin-dashboard--adobe.hlx.live/views/rum-dashboard?domainkey=8e884fda-f644-4708-b583-a4b0715068cd&url=www.hlx.live

[aem-code-sync[bot]]

Hello, I'm Franklin Bot and I will run some test suites that validate the page speed. In case there are problems, just click the checkbox below to rerun the respective action.

• [ ] Re-run PSI Checks

[aem-code-sync[bot]]

Page	Scores	Audits	Google
/views/rum-dashboard?domainkey=8e884fda-f644-4708-b583-a4b0715068cd&url=www.hlx. live