Improve auth-server homepage design & update dataseeder #15295
Description
Commercial side of https://github.com/abpframework/abp/pull/17660
Checklist
- I fully tested it as developer / designer and created unit / integration tests
- I documented it (or no need to document or I will create a separate documentation issue)
- I worked with the design team to get their idea for UI/UX design (or no need to design for this PR)
- I've assigned reviewer, related labels and set a milestone for this PR