[🚧 WIP] refactor(docs): style upgrade program

[chenxch]

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[github-actions]

[github-actions]

🧪 Playground Preview: https://element-plus.run/?pr=10754
Please comment the example via this playground if needed.

[chenxch]

Remaining Unupgraded Components Documentation

• DateTimePicker
• Form
• Select
• Select V2 virtualized selector
• Slider
• Switch
• TimePicker
• TimeSelect
• Transfer
• Upload
• Carousel
• Collapse
• Descriptions
• Empty docs(components): [empty] use new display tag #12662
• Image
• Infinite Scroll
• Pagination
• Result docs(style): [result] use new display tag #12661
• Skeleton docs(components): [skeleton] use new display tag #12667
• Table
• Virtualized Table
• Tag
• Timeline docs(components): [timeline] use new display tag #12664
• Tree
• TreeSelect
• Tree V2 virtualized tree
• Dropdown
• Menu
• Page Header
• Steps
• Tabs
• Dialog
• Drawer
• Message Box
• Popover

[wzc520pyfm]

@chenxch
I'd like to claim
Tag #12659
Result #12661
Empty #12662
TreeSelect #12663
Timeline #12664
PageHeader #12665
Skeleton #12667
Infinite Scroll #12670
Descriptions #12673
Switch #12678
Pagination #12680
TimePicker #12691
TimeSelect #12700
Upload #12701
Form #13007
Transfer #13033
Image #13024
Select #13301
Dialog #13499
Slider #14711
DatePicker #14754
Select V2 virtualized selector #15329
Carousel #14953
Collapse #14955
Dropdown #15378
Tab #15380
Menu #15385
popver #15387
table #15697
component.

[wzc520pyfm]

@chenxch
I found that some emit from tooltip did not write documentation, such as before-show, should I consider adding it?