docs: add maturity model check

[suyanhanx]

No description provided.

[suyanhanx]

I left some items unfinished. We can deal with them later.

[Xuanwo]

I left some items unfinished. We can deal with them later.

What's your plan about this PR? Are you still working on this? I find it still draft but no progress in 3 days.

[suyanhanx]

I left some items unfinished. We can deal with them later.

What's your plan about this PR? Are you still working on this? I find it still draft but no progress in 3 days.

I'm still working on this. I will change those unfinished items' status to No. so that this PR can be merged first.
I'll finish it this weekend.

Then I'll create a task issue to track those unfinished items.

For some of the items, that are missing content of the website, I'll add them.
For others, like all deps' license checks, we may need to finish them together.

[PsiACE]

lgtm

[suyanhanx]

Updated. PTAL @Xuanwo

[suyanhanx]

Updated. Please take another look. @Xuanwo

[Xuanwo]

Thanks!