Simplify README

The UCI protocol is rather technical and has little value in our README. Instead
it should be explained in our wiki. "Contributing" is moved above "Compiling
Pikafish" to make it more prominent.

Also move the CONTRIBUTING.md into the root directory and include it in the
distributed artifacts/releases.

No functional change

.github/workflows/pikafish.yml

@@ -97,6 +97,7 @@ jobs:
             ${{ matrix.config.name }}/*
             Wiki
             AUTHORS
+            CONTRIBUTING.md
             Copying.txt
             README.md
             Top CPU Contributors.txt

README.md

@@ -60,40 +60,9 @@ This distribution of Pikafish consists of the following files:
   * a file with the .nnue extension, storing the neural network for the NNUE
     evaluation.
 
-## The UCI protocol
-
-The [Universal Chess Interface][uci-link] (UCI) is a standard text-based protocol
-used to communicate with a chess engine and is the recommended way to do so for
-typical graphical user interfaces (GUI) or chess tools. Pikafish implements the
-majority of its options.
-
-Developers can see the default values for the UCI options available in Pikafish
-by typing `./pikafish uci` in a terminal, but most users should typically use a
-xiangqi GUI to interact with Pikafish.
-
-For more information on UCI or debug commands, see our [documentation][wiki-commands-link].
-
-## Compiling Pikafish
-
-Pikafish has support for 32 or 64-bit CPUs, certain hardware instructions,
-big-endian machines such as Power PC, and other platforms.
-
-On Unix-like systems, it should be easy to compile Pikafish directly from the
-source code with the included Makefile in the folder `src`. In general, it is
-recommended to run `make help` to see a list of make targets with corresponding
-descriptions.
-
-```
-cd src
-make -j build ARCH=x86-64-modern
-```
-
-Detailed compilation instructions for all platforms can be found in our
-[documentation][wiki-compile-link].
-
 ## Contributing
 
-__See [Contributing Guide](./.github/CONTRIBUTING.md).__
+__See [Contributing Guide](./CONTRIBUTING.md).__
 
 ### Donating hardware
 
@@ -117,6 +86,26 @@ Discussions about Pikafish take place these days mainly in the Pikafish
 [Discord server][discord-link]. This is also the best place to ask questions
 about the codebase and how to improve it.
 
+
+## Compiling Pikafish
+
+Pikafish has support for 32 or 64-bit CPUs, certain hardware instructions,
+big-endian machines such as Power PC, and other platforms.
+
+On Unix-like systems, it should be easy to compile Pikafish directly from the
+source code with the included Makefile in the folder `src`. In general, it is
+recommended to run `make help` to see a list of make targets with corresponding
+descriptions.
+
+```
+cd src
+make -j build ARCH=x86-64-modern
+```
+
+Detailed compilation instructions for all platforms can be found in our
+[documentation][wiki-compile-link].
+the [UCI commands][wiki-uci-link] supported by Pikafish.
+
 ## Terms of use
 
 ### GNU General Public License version 3
@@ -163,7 +152,7 @@ also be made available under GPL v3.
 [website-link]:			https://pikafish.org
 [website-blog-link]:  https://pikafish.org/
 [wiki-link]:          https://github.com/official-pikafish/Pikafish/wiki
-[wiki-usage-link]:    https://github.com/official-pikafish/Pikafish/wiki/Download-and-usage
 [wiki-compile-link]:  https://github.com/official-pikafish/Pikafish/wiki/Compiling-from-source
-[wiki-commands-link]: https://github.com/official-pikafish/Pikafish/wiki/Commands
+[wiki-commands-link]: https://github.com/official-pikafish/Pikafish/wiki/UCI-&-Commands
+[wiki-usage-link]:    https://github.com/official-pikafish/Pikafish/wiki/Download-and-usage
 [worker-link]:			https://github.com/xyztnecniV/yolo