Tolulope Malomo

Mobile: fix side-menu width on tablet devices

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### Summary This pull request fixes the issue of the side-menu becoming too wide on devices with wider screens like tablet devices. It's a part of the [Tablet Layout Project](https://discourse.joplinapp.org/t/joplin-mobile-tablet-layout/25775)

Mobile: Fixes #6872: Editor goes off screen after rotate

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# Summary This pr fixes issue #6872 Video Demo: [tablet-layout-fix.webm](https://user-images.githubusercontent.com/30352484/191389289-d8d1cc8d-f0bf-4469-95ca-096cc670c655.webm)

Mobile: Add split layout

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This pull request is a continuation of the gsoc tablet layout project ### What's added: - Split layout functionality Simultaneous view and editing. - View button You can press this...