Add the initial SR2023 rules

Based on srobo/rules@184c91e,
build artefacts from https://app.circleci.com/pipelines/github/srobo/rules/219/workflows/025b7e62-d960-4881-887b-ecbe98864540/jobs/292/artifacts.

Fixes srobo/tasks#952

Author: PeterJCLaw

resources/2023/rulebook.html

@@ -6,7 +6,12 @@ title: 2023 Rules
 2023 Rules
 ==========
 
-The rules, regulations and specifications for the SR2023 competition will be released at Kickstart.
+[<img class="left" src="{{ site.baseurl }}/resources/2023/rulebook.png" />]({{ site.baseurl }}/resources/2023/rulebook.html)
+The rules, regulations and specifications for the SR2023 competition can be
+found in the [rulebook]({{ site.baseurl }}/resources/2023/rulebook.html).
+
+The rules may be subject to changes, so please ensure you're using the most up-to-date version.
+We will also let you know of any important changes by email.
 
 Previous Rules
 ==============