docs: add Trivalent section to features page

[Ganwtrs]

Closes #95

I just took most of the information from GrapheneOS’s Vanadium section and @RKNF404 ’s Trivalent section

I definitely got some info wrong, but I just took the features from GrapheneOS’s section and took away

Details

- Hardware memory tagging (MTE) enabled for the main allocator

• Native Android autofill implementation to avoid needing sandboxed Google Play for autofill support
• Native Android credential manager support for passkeys to avoid needing sandboxed Google Play for passkey support
• Standard Android 16 user agent reduction is enabled early for the WebView to replace the major OS version, device model and browser minor/build/patch version with standard placeholder values
• Battery API always shows the battery as charging and at 100% capacity
• Consistent browser behavior across users without usage of feature flags and seed-based trials
• Nearly all remote services disabled by default or removed. Only connects to GrapheneOS servers by default. There are only 2 default services: component updates such as certificate authority and certificate revocation updates and DNS-over-HTTPS connectivity checks when enabled
• Web search and global search intents to replace the need for an OS search app
• Option to always open links from other apps, custom tabs, search intents and share intents in Incognito mode
• Option to reduce or disable sending cross-origin referrer information sharing where a link was opened
• Hybrid post-quantum cryptography enabled by default to match the behavior of Chromium on desktop since the devices we support are more than fast enough
• Bookmark export and import

[codacy-production]

Up to standards ✅

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[RoyalOughtness]

Trivalent is already included here, as well as selinux confinement. I'm not sure why a separate section is needed?

[Ganwtrs]

#95 (comment) It’s like GrapheneOS’s Vanadium section, and you said

yeah we should probably have that somewhere

[RoyalOughtness]

yeah we need it somewhere and I did say maybe a subsection of features, that page is rather concise though and it'd be nice to keep it that way and instead put together a comprehensive article about Trivalent and link to it

[RoyalOughtness]

If anything, this section needs to be updated, since we build our own kernels now

[Ganwtrs]

I think a separate PR would be more appropriate for that, but I’ll see if I can work on it