[docs] Improve getting-started page

[alexfauquette]

Fix #5290

main modifications:

• explain briefly how libraries interact
• replace @date-io installation by the date-library installation (Update getting-started.md #5242 (comment))
• replace long cli instructions by an interactive one

before: https://mui.com/x/react-date-pickers/getting-started/
after: https://deploy-preview-5293--material-ui-x.netlify.app/x/react-date-pickers/getting-started/

[mui-bot]

These are the results for the performance tests:

Test case	Unit	Min	Max	Median	Mean	σ
Filter 100k rows	ms	243.7	406.2	384.1	335	72.239
Sort 100k rows	ms	435.4	802.4	704.6	652.34	125.058
Select 100k rows	ms	83.1	246.9	167.8	157.3	54.526
Deselect 100k rows	ms	101.1	226.8	163.4	163.88	42.607

Generated by 🚫 dangerJS against f23900b

[joserodolfofreitas]

Nice! I like the interactive proposal on defining what to install

It touches a pain I felt yesterday. Perhaps we can consider updating the other installation pages as well (Not on this PR).

[flaviendelangle]

A lot better than today !

[oliviertassinari]

The layout is a bit broken on mobile.

[oliviertassinari]

Fix #5290

Are we sure? I understood the issue as the user doesn't want to use moment. It also seems to about the lack of a live demo, e.g. with the Chinese calandar like in https://ant.design/components/date-picker-cn/

[alexfauquette]

From the answer, I assume that adding explanations in the doc fix the pain of the user

@flaviendelangle, your explanation is exactly what I mean to be added to MUI docs.

Your explanation made it much clearer. You can even extend it. Now I have a better understanding of what should I search for.

[flaviendelangle]

We will be able to improve it later based on feedback, but it's already 100x better than the existing

[Nefcanto]

@alexfauquette, thank you so much.

I read the improved docs and now I can understand the architecture of date-time handling in MUI.

Still, a couple of demos would be great. But this is good enough.

Now everything is clear and thank you so much for this clarification.

[oliviertassinari]

@alexfauquette OK great.

@Nefcanto 👍 it could make sense to open a new GitHub issue about having a Chinese calendar demo. If we want to attract this audience, it would be a good opportunity to communicate them that we give it value, and to more easily test that it works as expected.

[Nefcanto]

@oliviertassinari it would be awesome. But I'm not from China. I'm from Iran.

However, I would gladly help. I can create the issue, but in English. And I would test them in my own applications.

Please let me know if I should open the issue or not.