feat: inline sub page mention

[Xazin]

Relates: #5692 #5417 #5134

Feature Preview

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PR Checklist

• [x] My code adheres to AppFlowy's Conventions
• [x] I've listed at least one issue that this PR fixes in the description above.
• [x] I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• [x] All existing tests are passing.

[github-actions[bot]]

🥷 Ninja i18n – 🛎️ Translations need to be updated

Project /project.inlang

lint rule	new reports	level	link
Missing translation	81	warning	contribute (via Fink 🐦)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 64.90%. Comparing base (7ecf213) to head (31b597d). Report is 155 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6567 +/- ## ========================================== - Coverage 74.41% 64.90% -9.52% ========================================== Files 245 271 +26 Lines 6566 10399 +3833 Branches 1057 1409 +352 ========================================== + Hits 4886 6749 +1863 - Misses 1628 3492 +1864 - Partials 52 158 +106 ``` | [Flag](https://app.codecov.io/gh/AppFlowy-IO/AppFlowy/pull/6567/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AppFlowy-IO) | Coverage Δ | | |---|---|---| | [appflowy_web_app](https://app.codecov.io/gh/AppFlowy-IO/AppFlowy/pull/6567/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AppFlowy-IO) | `64.90% <ø> (-9.52%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AppFlowy-IO#carryforward-flags-in-the-pull-request-comment) to find out more.

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[LucasXu0]

@Xazin Is it possible to add a feature flag to control this feature?

[Xazin]

@Xazin Is it possible to add a feature flag to control this feature?

Yes, let me add it :+1: