Make Lessons default for gitea

2025/README.md

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+# Advent of Code 2025
+
+## Introduction 
+This is mostly so I can keep notes on my progress, in single markdown format so I can easily add it to my Silverbullet journal afterwards.
+
+## Lessons from first day
+
+1. Read! Oh that brain of mine, skipping half the things and missing things like count clicks not end point dial
+2. Setup a proper test, make a smaller input test that you know the answer to to check the code
+
+
+## Lessons second day
+
+1. More git commits!
+2. Clear history so you don't accidentally cp day1 to day2 during testing. (Undo FTW)
+3. Put the central check (Serial Valid/Invalid) in a function so it's easy to add self checks in the beginning
+