[docs] Copyedit pages.ts navigation

[samuelsycamore]

related to: #2904 (comment)

• renamed "Advanced" to "Custom behavior"
• enforced sentence case across all titles
• removed ampersands
• shortened "Custom slots and subcomponents" to "Custom subcomponents"
• removed "Group and Pivot" group to expose more Premium features

[mui-bot]

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[LukasTy]

If you feel that slots and part doesn't bring any clarity, I'm fine with it. 👌
But if we rename a menu item, shouldn't we also align that page heading as well? 🤔

I'd ask for a pair of eyes from @mui/xgrid given that most renaming impacts their links.

[flaviendelangle]

shortened "Custom slots and subcomponents" to "Custom subcomponents"

The main goal was to improve the searchability of this section.
slots is the name of the prop and the name of the technical concept.

If we remove it from the sidebar, then I think it should at least be kept on the page title so that Algolia is able to find this page when searching for slots

[cherniavskii]

Thanks!

[samuelsycamore]

If we remove it from the sidebar, then I think it should at least be kept on the page title so that Algolia is able to find this page when searching for slots

This makes sense to me. The navbar change is more about aesthetics than anything else, but as long as the page is still discoverable via search then we should be good.

[samuelsycamore]

As I spend more time with the X nav bar, I'm starting to feel like the Data Grid navigation could use more structure in the form of subheaders to group different categories of docs (for example, AG Grid has "Core Features," "Advanced Features," and "Miscellaneous"), but that's beyond the scope of the changes here. I'll follow up with another PR to explore this.

[flaviendelangle]

As I spend more time with the X nav bar, I'm starting to feel like the Data Grid navigation could use more structure in the form of subheaders to group different categories of docs (for example, AG Grid has "Core Features," "Advanced Features," and "Miscellaneous")

I agree that grouping pages like we are doing on the pickers can be a nice middle ground between a collapsed folder and a totally flat structure.

Just be careful, last time I tried, when you have a group and then a page below, the page below looks like its in the group, we should probably improve the padding to show that its outside of it.