code rework for page 1

[wzt1001]

Issue #, if available:

Description of changes:

1. reorganized page layouts, cleaned mainpage and first generative BI search page.
2. added hints for users to notice data profiles in the bottom left corners in "Performance customization" pages
3. reformated code in the first generative BI search page, so that different steps in generation process can be rendered separately.
4. added popup hints for sidebar

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.