Make Monotonic implementation more obvious

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-# Implementing a `Monotonic` timer for scheduling
-
-The framework is flexible because it can use any timer which has compare-match and optionally supporting overflow interrupts for scheduling. The single requirement to make a timer usable with RTIC is implementing the `rtic-time::Monotonic` trait.
-
-For RTIC 1.0 and 2.0 we instead assume the user has a time library, e.g. [`fugit`], as the basis for all time-based operations when implementing `Monotonic`. These libraries make it much easier to correctly implement the `Monotonic` trait, allowing the use of almost any timer in the system for scheduling.
-
-The trait documents the requirements for each method. There are reference implementations available in [`rtic-monotonics`] that can be used for inspriation.
-
-- [`Systick based`], runs at a fixed interrupt (tick) rate - with some overhead but simple and provides support for large time spans
-- [`RP2040 Timer`], a "proper" implementation with support for waiting for long periods without interrupts. Clearly demonstrates how to use the `TimerQueue` to handle scheduling.
-- [`nRF52 timers`] implements monotonic & Timer Queue for the RTC and normal timers in nRF52's
-
-## Contributing
-
-Contributing new implementations of `Monotonic` can be done in multiple ways:
-* Implement the trait behind a feature flag in [`rtic-monotonics`], and create a PR for them to be included in the main RTIC repository. This way, the implementations of are in-tree, and RTIC can guarantee their correctness, and can update them in the case of a new release.
-* Implement the changes in an external repository.
-
-[`rtic-monotonics`]: https://github.com/rtic-rs/rtic/tree/master/rtic-monotonics/
-[`rtic_time::Monotonic`]: https://docs.rs/rtic_time/
-[`fugit`]: https://docs.rs/fugit/
-[`Systick based`]: https://github.com/rtic-monotonics
-[`rtic-monotonics`]:  https://github.com/rtic-rs/rtic/blob/master/rtic-monotonics
-[`RP2040 Timer`]: https://github.com/rtic-rs/rtic/blob/master/rtic-monotonics/src/rp2040.rs
-[`nRF52 timers`]: https://github.com/rtic-rs/rtic/blob/master/rtic-monotonics/src/nrf.rs
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