Add ANNUAL-UPDATES.md

Author: oalders

ANNUAL-UPDATES.md

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+# Preparing for a New Calendar Year
+
+Much of this process is automated, but there are a few things which need to be
+updated by hand every year. Hopefully we can automate more and more, but this
+should be a good starting point checklist for what needs to be done before a
+new calendar can be launched.
+
+## Create Scaffolding
+
+```shell
+mkdir -p 2024
+cp 2023/advent.ini 2024
+```
+
+## Find and Replace
+
+The calendar year is hard coded in various places. Update them to the current
+year in:
+
+```shell
+perl -pi -e 's/2023/2024/g' \
+    in-season.html          \
+    script/build-site.sh    \
+    script/stats.sh         \
+    2024/advent.ini
+```