Change README links to reflect repo moves

Author: rmn30

README.md

@@ -2,16 +2,16 @@
 
 This repository contains the specification for the [CHERIoT](https://cheriot.org) ISA.
 It consists of a document written in [latex](/archdoc) which includes excerpts of the [reference model](/src) written in [Sail](http://github.com/rems-project/sail).
-The [current draft architecture document](https://microsoft.github.io/cheriot-sail/cheriot-architecture.pdf) built from this repository contains a full description of the ISA and its intended use by [CHERIoT RTOS](https://github.com/microsoft/cheriot-rtos/).
-The Sail code is used to build an instruction set simulator which is included in the [CHERIoT RTOS dev container](https://github.com/microsoft/cheriot-rtos/blob/main/docs/GettingStarted.md).
+The [current draft architecture document](https://cheriot.org/cheriot-sail/cheriot-architecture.pdf) built from this repository contains a full description of the ISA and its intended use by [CHERIoT RTOS](https://github.com/CHERIoT-Platform/cheriot-rtos/).
+The Sail code is used to build an instruction set simulator which is included in the [CHERIoT RTOS dev container](https://github.com/CHERIoT-Platform/cheriot-rtos/blob/main/docs/GettingStarted.md).
 It can also be used to prove [properties](properties) of the ISA using Sail's SMT support.
 
 The architecture is based on the [CHERI specification](https://github.com/CTSRD-CHERI/cheri-specification).
 The code is derived from [sail-cheri-riscv](http://github.com/CTSRD-CHERI/sail-cheri-riscv) and uses [sail-riscv](http://github.com/rems-project/sail-riscv) as a submodule.
 
 # Building
 
-The easiest way to use the emulator is to use the dev container for the CHERIoT RTOS as described in the [getting started guide](https://github.com/microsoft/cheriot-rtos/blob/main/docs/GettingStarted.md).
+The easiest way to use the emulator is to use the dev container for the CHERIoT RTOS as described in the [getting started guide](https://github.com/CHERIoT-Platform/cheriot-rtos/blob/main/docs/GettingStarted.md).
 
 Alternatively, if you wish to build from source you must first install dependencies, including Sail. For example, on Ubuntu 20.04 we have tested:
 
@@ -25,7 +25,7 @@ opam install sail
 Then clone the repo:
 
 ```
-git clone --recurse-submodules https://github.com/microsoft/cheriot-sail
+git clone --recurse-submodules https://github.com/CHERIoT-Platform/cheriot-sail
 cd cheriot-sail
 ```