[EPIC] Redesign DataFusion main page

### Is your feature request related to a problem or challenge?

Users currently fell a little bit lost when dealing with Datafusion main page https://github.com/apache/datafusion

Imho the page is overloaded with too technical information, navigations to examples, quick start are not very intuitive.

### Describe the solution you'd like

Would be nice to redesign the main page and let it be the face of Datafusion. It should contain intuitive steps to get familiar with Datafusion, quick start, contribution, diagram in short what exactly makes DataFusion a DataFusion, supported features.

For the naive design we can refer to https://github.com/StarRocks/starrocks which is way more user friendly

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

Start by reviewing the current DataFusion main page at https://github.com/apache/datafusion and compare its navigation and content with the StarRocks example linked in the issue. Define a clearer first-time-user path covering introduction, quick start, examples, contribution, architecture, and supported features; done means the redesigned page presents these areas intuitively.

Written by the indexing model from the issue text.