Improve Settings page display

[Ben8t]

Provide more structured/organized settings:

• Group settings per topics, e.g., Language & Appearance, Editor, Environment, Execution.
• Reduce the size of unnecessarily large inputs

https://www.figma.com/file/ew0uXk0NRXJ2NBBJTNe2n1/UI?type=design&node-id=647%3A4752&mode=design&t=7So8q4uLoBLC3djL-1

[Nico-Kestra]

[Figma](https://www.figma.com/file/4tLhsoCsh9yVzYRY1N70kS/App-Kestra?type=design&node-id=2654%3A69358&mode=design&t=47O6AFhLt29YOd2a-1)

[Nico-Kestra]

I think it was interesting to have a third option for the theme mode: "Sync with system." Is it difficult to implement?

[tchiotludo]

@Nico-Kestra, no, please create a separate issue :+1:

[anna-geller]